To top up your balance by Bitcoin, Credit Card and in another way, you may buy a refill code from the links:
Refill code for 2,5 USD
Refill code for 2,6 USD
Refill code for 5 USD
Refill code for 10 USD
Refill code for 20 USD
Refill code for 55 USD
Refill code for 105 USD
Refill code for 190 USD
The code can be activated in the members area.