First you need to make a paypal account
Second you need to make your account verified by adding a bank account in it. You can also add credit card or debit card too and send money it that cards but here we'e talking about bank account.
Third you need to click on the "Withdraw" tab in the menu.
Fourth you need to enter the amount to withdraw to your nominated bank account in paypal.
Transferring fund in your bank account from paypal is free and it takes 4-6 working days.