Just make sure in your account  on multipool you have put in your receive wallet address and saved it. From there you can set the minimum payout threshold or do a manual payout request.

On your PC wallet click receive tab and indicate a name from who you are receiving (in the label line) then click request payment. Then you will see an address line associated with that label. Double Click on it (or click show) Opens a new window, then click "copy address" use that on your multipool payout address to receive your coins....