Why I can’t access to alpha test

I don’t have access to this alpha test and have only watched the behind the scenes so I’m not sure if this is already an option.

However, I was just wondering if there could be an option for those with dual screens. Perhaps a completely full screen game play window on one screen with all interfaces occupying the second screen / a mixture of both. If I still can’t access, I will sell runescape accounts to others.