UserName

This should be the page's Twitter handler without the @ symbol.

Show Header

When enabled, a header will be added at the top of your feed with a link to the Twitter feed and a link to the Twitter Ads Info and Privacy page

Show Footer

When enabled, a footer will be added at the end of the feed with an option to embed it somewhere else and an option to view it on Twitter

Max Tweets

Set how many Tweets you'd like to show at any one time. The latest Tweets will be retrieved.