One of the biggest struggles that campaigns often have is getting in touch with college students come election time. That's because in the weeks running up to election day they're often not living at their voting address, but in a dorm room or apartment in their college town. With classes beginning soon, students are going to be heading back to school soon if they haven't left already. If you know a college student, it is therefore important that you make sure they request an absentee ballot.
Many local political parties send out applications to people in the age range of 18 to 22 if they'd been id'd to support that party. If you're among those who have received an application this way all you have to do is fill out the application and then wait for your absentee ballot to come in the mail. If you haven't had one sent to you already, however, you can request an application by simply mailing in a form that is available via the State Board of Elections' website (here's the pdf).
It should be noted that as of now, it's simply important to make sure the students fill out the application requesting an absentee ballot. Once they've been sent out (usually about 45 days before the election) it's then important to encourage them to fill out the ballot and send it in so that their voice can be heard.