Log into your account through the web browers.
You should have set up your unique URL at sign-up...it would look something like: yourtreecompany.treeziapp.com
Or you can login through the website: portal.treezitreecare.com
Use the same credentials that you login for the mobile app.
1. Go to "Users" tab
2. Click on the email address
Edit info in the window that pops up, and then click save.
You can also disable the user by checking the box that says "Login Disabled".