How can I subscribe a Premium group?

You must have enough fund to subscribe any premium group. You could make a deposit before you do that. You'll find TOP UP button in your wallet page.

Is there any fee?

We charge 20% fee of each withdrawal request.

How to withdraw my USD balance?

You need to make a withdrawal request in your wallet page. We will send you payment in bitcoin with market rate. It usually takes 48 hours to process withdrawal request.