How do I vote at university?

Provided I get good grades for my A-Levels, I'll be going to uni in September. I am registered to vote in Hexham, but my universities are in other constituencies (mainly in Scotland).

So, if the upcoming general election is in October like predicted, how do I vote?

Should I register to vote in a different constituency? Or can I have my postal vote rerouted to Scotland?

It's my first time for all of this, so I don't even know what's legal and what isn't when it comes to voting. Can anyone help?