It's very easy, just do the following steps!
- Sign up at our forum(If you have account already, skip this step) and log in
- Send a PM to one of our forum's admin, tell us why do you want to join our beta test
- Wait for permission
- Make sure you have enabled your private message, sometimes we will ask more questions
- If we accepted your request, you can go to Beta Test Zone in our forum to see if we have any new beta test