If you wish to manually withdraw a payout, you need to have enough commission in the ongoing period that covers the fee of this feature. Until this requirement is met, the button remains inactive.
To prevent any delays, the Fast Payout function can be set to Automatic before a period ends, in which case the fee of the feature is deducted from that period’s payout automatically. The Automatic feature can be enabled in your affiliate account, under Payout menu.