To withdraw available funds, they must be in your ‘SelfSelect’ account. You can move funds there using the ‘Wallet Transfer’ button on your Dashboard.
Once the funds are there, ensure you have added the account you wish to withdraw to by going to the ‘Bank Details’ section on your dashboard.
You can then go to ‘Wallet Transfer’ and select the wallet you wish to withdraw the funds from and the account you wish to withdraw to along with the amount and submit the transfer.