Here is how to register your bank account:
1. Go into your PayPal account to the tab “Money” on paypal.com
2. Scroll down and click on "Link a bank account"
3. Click on "Link a new Card"
Two small transfers between €0.01 and €0.99 will be credited to your bank account. They will appear on your statement in 1 to 2 business days. The amount of these transfers will be the code you need to confirm your account.