my username email address is too long for some sites to register.

[Anonymous]

I am trying to register on a site that requires me to give my 02 username.  As my 02 username is my email address it is too long to register!  Help.  What can I do?

[Anonymous]

What site is it?

Any sites which require you to use your O2 username to login should accept the email address as most people have this.