The first step of the registration is filling in this form. You will receive an e-mail message with which you can confirm your registration. After confirmation you can login with your e-mail address and your password.
The password you entered appears on the list of collected passwords from data leaks. It is therefore a weak password that you should not use. I advise you to choose a strong and unique password (and not to use it on other websites).
Find your ancestors and publish your family tree on Genealogy Online via https://www.genealogieonline.nl/en/