Actually, you enter the lottery online through the site I posted a link to in my previous post. It's under the "M Deck Key Dates" link on the left. It's currently out of date, though, it's still showing the lottery for last Spring. It should be updated closer to the start of school. Note that to enter the lottery you have to register your car, which is free, and which you also do online.
I don't know if they accept lottery entries any other way (phone, fax, etc.), but I'm sure you can call the parking office and ask.
You're welcome for the info, btw. Glad to help