If anybody used it, and has any idea, please help me. How can I modify the number of words that it can syndicate. Right now I get the title of the post and 2 sentences and then '[...]'. But I would like to sydicate the whole post. What should I modify?
It really depends on RSS source. Some sites publish only post beginning in the RSS, some other publish full content. For example, Blogger users (blogspot.com) can set up site feed contents: short or full. So check your RSS source (download it or see it in a RSS reader). You can not get the full contents if it is not in RSS.