Transferring admin is really simple. Simply do the following:
- Go to Account → Security
- Change your email address
- Update profile
The owner of this email address will then be sent a verification link to confirm this change. They can then sign in with the existing password but can change it any time. Then, to add you as a user, they will need to do the following:
- Go to Account → Your Subscription
- Click on 'Manage Users'
- Input your email address to add you as a user
If you have any other questions about admin changes, please don't hesitate to get in touch.