First check whether you have enough balance in your account for withdrawal. Remember that minimum withdraw amount, For crypto withdrawals, minimum withdraw amount is #55 worth of BTC.
Secondly, check whether you have added your payment address for withdrawals. And if have added, check whether it is correct. If you have not added your payment address for withdrawals, go to edit profile page and update your payment address correctly.
For bitcoin withdrawals use addresses starting with 1 or 3 only.
If everything is correct and still you are not being able to withdraw your money, in such situation, contact our support team through the support form given on our site, with full details and screenshot of the error page.