How to view sky channels on a ZGemma 2S

Hi Guys------------------Just got my new ZGemma box and I got lots of questions. Can view all the freesat stuff no problem, but I got lots of questions. My large sat dish is connected to tuner B. I presume tuner A is for a seperate dish to view stuff on another sat. All I want to do is watch the sky stuff and I need to know exactly what I need to do to achieve this. So far I know I need openvix. How do I get this onto the box and having done so, how do I tune the sky channels. Is there something or a youtube I can watch.