I am from East Africa and ordered payoneer card some 8 days ago and in the "POBox" box I didn't wrote the code of my postal number, I only wrote my postal number. Will this create a problem in the delivery? And what shall I do? Thanks.
Yes, it will create a problem. You need to contact Payoneer straight away using the online chat or sending a support ticket. They probably will not process your application and if they do it could end up at the wrong address and you will have to pay a higher fee to get a new card.