Before we fix it, you must understand why it is breaking. CS.RIN.RU runs on an older forum engine (phpBB) with heavy custom modifications. Unlike modern websites, it does not have "one-click" registration.
The three main culprits for registration failure are: cs rin register not working free
Unlike standard public forums, CS.RIN.RU frequently toggles the ability to register new accounts. Before we fix it, you must understand why it is breaking
If you have multiple userscripts running on the same page, they can conflict. Before we fix it