Toni:
Welcome to the Twitter bandwagon! LOL
I don't have much experience with the plugin you're using, but may I recommend Twitter Tools instead?
http://alexking.org/projects/wordpress
I think it'll do what you're looking for. I tried a lot of different Twitter plugins until I landed on this one. You can put it in your sidebar, and tell it how many tweets you want to display. Plus, you can have it create posts for your tweets, or just one digest post of all your tweets in a day (or not at all). And you can post to Twitter from WordPress (it adds a "Write Tweet" option under the Write menu).
I'm using it on my blog (in the sidebar and digest posts), and I've been pretty happy with it.
Just a thought.
= )
--D.