Open your Crowd1 account:
Then go to Account section:
Then Withdraw to Bitcoin:
Then put the amount which you want to withdraw. Minimum balance will be $20.
Then put the Luno wallet Address.
You must have the address of Luno wallet only then you will be able to withdraw money.
After that you can also transfer your money from Luno wallet to bank account.
Note: Please complete your KYC otherwise you will not able to transfer money.