Post a message on the forums letting us know that you want to join. Then one of the moderators can agree to play with you to get to know you better. This is not a test of skill, it's just a game to let us get to know you.
The STR has implemented a new policy. For you to become a new member you will need to get two current STR members to vouch for you. This is a lot easier than it sounds. Just worry about playing and having fun, as that is the main point of being here in the first place.
It is recommended that you join our Discord so that we can easily get in touch with you when we need to. Whilst back in the day we were all about IRC and Teamspeak, these days Discord takes care of all our text and voice needs!
And most of all HAVE FUN!