document how to ask for an account

Closes: #40063

howto/gitlab.md

@@ -29,8 +29,8 @@ over to the [password reset page](https://gitlab.torproject.org/users/password/n
 If your account was *not* migrated, send a mail to
 <gitlab-admin@torproject.org> to request a new one.
 
-We hope to have something else in place for user registration once the
-migration is successful.
+If you did not have an account in Trac and want a new account, you
+should request a new one at <https://gitlab.onionize.space/>.
 
 ## How to report an issue in Tor software?