If you have not registered before then please ask ask your account manager to fill out the application form.
After approval, SOLIDWORKS send a new serial number for us to pass onto you, this serial key should then be given to the students. Students use this key for installation, and then activate the software to gain full functionality. Without activation they only get a 30 day trial. Activations are capped at the number of licenses you have on campus.
If you have applied for an SEK serial key in the past, Solid Solutions can provide a reminder of the key you do not need to reapply.