You can manage your users associated with your account to change their role or remove them from client portal.
Steps to Change a User’s Role
Log into your account in Client Portal and go to My Account > Settings > Users & Roles.
Click the three dots > Edit User
Select the changing role between Administrator, Editor and Basic
Steps to Delete a User
Log into your account in Client Portal, go to My Account > Settings > Users & Roles.
Click Remove.