Delete family trees

Panoréa - As most sites with a login: click on your own name at the to to get to your account settings.
There you will find an option for closing your account: https://www.geni.com/account_settings/close_account

As part of closing your account you will have options on what to do your profiles, but since you are a single user in a standalone tree you have the option to completely delete your tree.

I see now that you was able to manually delete all your profiles so you can start up again, so we can conclude ¨: problem solved.