Adding the Twitter Feed
It's easy to put your Twitter feed anywhere on your site. All you need is to insert a simple DIV on the page(s) you want and that will call a back-end phtml file that loads everything you need.
The code you want to add is...
Configuring the Twitter Feed
Once you've added the Twitter code on your site you'll want to configure it to pull the right account. Just log in to your Magento Admin Panel and navigate to System > Configuration > Commative > Twitter Feed and you'll see options for putting in your Twitter account and setting how many posts you want to display. There's also an option for modifying the cache length, but you can generally leave that one alone.