How to be the tester for Focus 2 Beta ?

Hello
I bought theme Focus but I have the problem with Czech language (Latin-ext). I tried FOCUS 2 Beta 2 and it look more better about this case. Of course there is some other problem but I can wait for final version of Focus 2 and till this time I can help as the tester. I don’t know how is possible to communicate with you about this new version theme Focus 2.