Step 1 - Fill in necessary information about your website
Insert root URL and click Autocomplete and the title of your RSS feed and description will be filled with your web site's information in <TITLE> tag and META tag "description". All other fields in Channel tab are optional.
Step 2 - Enter RSS feed item URL, title and description as many as you need and save your generated RSS file.
You don't need to use Optional section, this only for specific websites. However you can see what's in Optional bar and may be find something useful for your website.

Step 3 - Upload to server and insert the following meta tag into all pages of your website in <head> tag:
<link rel="alternate" type="application/rss+xml" title="RSS" href="/rss.xml" />
Where title is your RSS title and "rss.xml" is your RSS file name. You should change it with the file name that you saved.

Step 4 - Ping to RSS servers

You can switch to Channel Optional Tab by clicking "Show Optionals" button. Optional items and fields are not mandatory to fill but in some cases information in those fields are very useful. In Optionals tab you can find following fields and items:

Editor, Editor's E-mail
Name and Email address for person responsible for editorial content;
Webmaster, webmaster's E-mail
Name and Email address for person responsible for technical issues relating to channel;
Copyright
Copyright notice for content in the channel. Example:
Copyright 2007, Emergency Soft
Publication Date
The publication date for the content in the channel;
Last Build Date
The last time the content of the channel changed;
Language
The language the channel is written in. This allows aggregators to group all language sites on a single page;
Skip Hours
A hint for aggregators telling them which hours they can skip whose value is a number between 0 and 23, representing a time in GMT, when aggregators, if they support the feature, may not read the channel on hours listed in the Skip Hours. The hour beginning at midnight is hour zero.
Skip Days
A hint for aggregators telling them which days they can skip whose value is Monday, Tuesday, Wednesday, Thursday, Friday, Saturday or Sunday. Aggregators may not read the channel during days listed in the Skip Days.
Time to live
It stands for time to live. It's a number of minutes that indicates how long a channel can be cached before refreshing from the source.
Rating
The PICS rating for the channel.
Category
Specify one or more categories that the channel belongs to. It has one optional attribute, domain, that identifies a categorization taxonomy.

Cloud
Cloud specifies a web service that supports the rssCloud interface which can be implemented in HTTP-POST, XML-RPC or SOAP 1.1.
Its purpose is to allow processes to register with a cloud to be notified of updates to the channel, implementing a lightweight publish-subscribe protocol for RSS feeds. Example:

Domain: rpc.sys.com
Port: 80
Path: /RPC2
Register Procedure: myCloud.rssPleaseNotify
Protocol: ml-rpc
In this example, to request notification on the channel it appears in, you would send an XML-RPC message to rpc.sys.com on port 80, with a path of /RPC2. The procedure to call is myCloud.rssPleaseNotify.
Image
Specifies a GIF, JPEG or PNG image that can be displayed with the channel. This is an optional sub-element, which contains three required and three optional sub-elements.

URL is the URL of a GIF, JPEG or PNG image that represents the channel.
Press "Autocomplete" to automoatically fill all the fields in Image sub-element or you can fill in information manually.
Title describes the image, it's used in the ALT attribute of the HTML <img> tag when the channel is rendered in HTML.
Link is the URL of the site, when the channel is rendered, the image is a link to the site. Note, in practice the image Title and Link should have the same value as the channel's Title and Link.
Optional elements include Width and Height, numbers, indicating the width and height of the image in pixels. Description contains text that is included in the "TITLE" attribute of the link formed around the image in the HTML rendering.
Maximum value for width is 144, default value is 88.
Maximum value for height is 400, default value is 31.
Text Input
Specifies a text input box that can be displayed with the channel which contains four required sub-elements.

Title -- The label of the Submit button in the text input area.
Description -- Explains the text input area.
Name -- The name of the text object in the text input area.
Link -- The URL of the CGI script that processes text input requests.
The purpose of the Text Input element is something of a mystery. You can use it to specify a search engine box. Or to allow a reader to provide feedback. Most aggregators ignore it.