Newbie wants to know how to access cam from remote on Cuberevo 250HD

Hi I have flashed my box with Vodka_V.0.0.5_250HD_usb_all_noboo tand it works fine BUT my satellite guy has accessed my box and can see several cccams there and asked me to change to another one. I cannot find anywhere how to do this. If I press the green button it syas starting the current cam and press it again it says stopping it. But there is nowhere I can see to change the cccam. The menu is very limited and there is nothing in any of the menus to offer me to change.

Please can anyone help.

Thanks