There are various options available:
(1) Twitter ID - Your twitter id/user name
(2) Numbers of Tweets - How many tweets to show?
(3) Sidebar Position - Left or Right sidebar position of the module
(4) Side Bar Open/close Speed - Select the open/close speed from various options available there
(5) Margin From Top - Position from top(in px)
(6) Include jQuery - If jQuery has been already included by any other extension, select 'No', otherwise 'Yes'
(7) Many other useful options like Twitter Button Theme, Box Corner, Background Color etc...