To deposit Bitcoin in an online casino like mBitcasino, log into your account and go to the cashier. Select 'Deposit' and choose Bitcoin (BTC) from the dropdown menu. Enter the amount you wish to deposit, scan the QR code provided using your crypto wallet, and complete the transaction. Before finalizing, consider opting in for any available crypto bonuses. Your deposit will be added to your mBitcasino balance shortly.