To receive your copy of the software, you must have an account of the form "YourUCInetID@uci.edu" on the Wolfram Mathematica Portal website: http://user.wolfram.com. If you do not already have a YourUCInetID@uci.edu account at that site, please go there and create one.
Login to the Wolfram User Portal for Students.
Specify your Department from the pulldown menu. If yours isn't listed, choose Other and enter it in the field.
Select the product "Mathematica for Students for Sites."
Enter your Anticipated Graduation date using the pulldown menus and then select Submit.
Follow the steps on the next page to begin the download. The software will come with a key allowing its use for a limited period of time, initially 15 days