I want to transfer wall ownership
Go to https://walls.io/me and enter the email address of the new wall owner. After you're done setting the wall up for the next person, log out.
The new admin then should go to the login window and after entering his email address, click on "I forgot my password", to receive an email to set up a new password.
Please be aware that changing the account owner does not change the person who pays
I want to change the person who pays
Go to https://walls.io/me and click on "edit my address/add VT ID".
In the new window click on "edit subscription".