If you are already a student of TSU, after the order for your enrollment was issued, TSU.Account was automatically created for you using the email that you specified in the admissions office while applying.
After automatic registration, you should have received an email with instructions on how to activate your TSU.Account.
If you didn't receive such an email, forgot your password, or can't sign in to TSU.Account, please contact support at support@accounts.tsu.ru.