To update your business details, just head to the top right menu, "My business", and then "Edit my business" to make the fields editable.
Fill in or update the required data. Any fields that are required will have an asterisk against them. So if you don't fill those in when you click save, you'll get a warning, and the system won't save it.
Towards the bottom of the form, there is a certifications authorizations waivers section, which we'll cover in a separate, video.
It does look for a valid website so you can enter your website address in there. If you don't have a website just enter google.com or something. Click "Save changes" and you'll get a confirmation. Go back to the "My business" page to view the updated details.