Law / Buying from Allegro using PayU or Paypal and paying for item [18]

Hi I recently put up an online store in allegro but being a foreigner there is a lot I don't get. Anyone who can explain to me Pay u coz at the moment I have 3 payments on pay u but I can't see the reflection in my bank account.How can i get the money Coz personally I can't send the items if i don't have access to the money.