I just attempted to join, but afterwards found out that I wasn't meant to have used a web e-mail (Obviously, this is my fault). Is there any way that I can get the address used in the application changed?
Well, it'd really help if you told us which application to check ... but usually applications with obviously free email addresses (e.g. hotmail, yahoo etc.) are automatically declined, so if you get an email telling you that your account was decliend, you can just sign up again.
Otherwise, please post some info here (e.g. the handle you signed up with).
Okay, it's been 24 hours so I did what it said in the "Problem: I haven't received my password!" thread, and got the invalid e-mail message. Rather than sign up with the same e-mail, I instead did it with my ISP mail. Just saying so it's known :)