You cant move money directly from one poker room to another. You need to withdraw first according to the policy of the room, you want to withdraw from. Once the money is then in your bank account, credit card etc., you can spend it, like you want, including to make a deposit at another poker room.
You can also use e-wallets like skrill , neteller , Ecopayz , if I remember correctly 888 doesn't charge anything for the withdraw but you must ''activate'' this method by depositing once and your country must provide this method for transactions.