Step 1:
Obtain a closed beta key here:
Step 2
Visit: https://subagames.com/Luna/ClosedBeta.aspx and submit your beta key, please note that you must be logged into your Suba Games account to proceed. If you do not have an account, you can sign up for an account at: https://subagames.com
Step 3
Download and install the game client. CB starts on March 30th, 2016 (5pm EDT)