Texanne, a much easier way to install the app, without messing with a computer, is to install it directly from your iphone. Click on "App store" on your iphone, then click search, and type in "Texas." It's the 2nd listed app in the search results.
Click "The university of texas at austin" in the search results (again, it's the 2nd listed result), then click the longhorn icon which appears, then click the little blue button in the upper right hand corner which says "FREE." That button will change to a green button which says "INSTALL." Click that button again.
It'll prompt you for your itunes password. Enter it in, and whammo, the thing will install right to your iphone. Obviously, you have to have a 3G signal or be in a wifi hotspot, but it's much easier than dealing with itunes (which is a bloated POS of a program).