I'm having trouble registering.

Please choose a username and password that meet the character requirements: min. 5 characters for usernames, min. 6 for passwords, a-z, 0-9, minus (-), underscore (_), full stop (.) permitted. Please note that usernames and passwords should be written in lower-case. It is possible that your desired username is already taken, in which case you'll need to choose another. You can also sign up with an existing Facebook or Google+ account.