The user name is allowed to use the uppercase and lowercase English letters, numbers, symbols "=", "-" and "_".

The password can use uppercase and lowercase English letters, numbers and symbols =-_!@#$%^&*()+|{};:,.~?.

Change the user name is possible only in exceptional cases (for example, when joining or leaving the squad), so a responsible approach to their choice!

One person may not register more than one account.