You can easily add your IBAN / bank account number by yourself to your profile. Keep in mind that the IBAN that you provide has to be in your own name.
Below you can read how to easily make the update:
Go to personal information;
Scroll down to 'Invoicing and payment';
Click on 'change';
Fill in your bank account number and click on ´save´;
Your bank account number has been added / changed.