You can now indicatively vote for a motion online. Follow the link below, log in to the NUSU website with your campus ID and simply click the up or down arrow to give your opinion on a motion. You can also leave a comment if you've got something to say. This isn't a substitute for the actual physical vote, but it's a great way for the proposers of motions to gauge wider student opinion that they might want to use in their speech.
Head to the motions page here.