How do I load my Payoneer GBP balance to my main Payoneer USD account ?

My main account is in USD & I have an active Payoneer Master Card for USD account, now I got some funds from peopleperhour as GBP, now, how do I upload that fund on my Payoneer card in USD & use it. These days, with one Payoneer account you get three currencies account USD, GBP, EUR, u know that right? Let me know. How do I load my Payoneer GBP balance to my main Payoneer USD account? Thanks! Get your Payoneer master card today with a bonus!