Well, I can on my phone but not on my iPad.
For some reason I've had to input my username / password (it didn't save for some reason) and it's saying my username is wrong (it's not)
Then it tells me to contact admin, then I get a message ' board administrator contact page has been disabled'
The only thing is your username or password must be wrong.... but it's worth checking your username hasn't been filled in automatically with your email address. Also check spaces and apostrophe are in exactly the same place as well.