To add/remove a user to your company, you'll need administrator privileges.
Removing a user
Go to the "Admin Settings" section at the bottom of the screen.
Select the user, then right click and select "Delete Person" or use the delete button at the top of the screen*.
*Note: This will remove the user from the AQ published directory for the company and release the AQ license assigned to the user so it can then be registered to a new user.
If the user is still at the company but no longer needs access to AQ, simply un-register the user instead of deleting them. This will free up their license so it can be given to a new user while retaining the user's listing in the AQ published directory.
The user's projects will still be retained and viewable indefinitely regardless.
Adding a new user
Go to the "Admin Settings" section and click "New" at the top left.
Enter the new user's details into the pop-up window and click on the tick when done.
To register them, right click their name and select "Register Person".
Assign them a user role in the pop-up and then click "Save Changes" at the top left of the section to save the new user.
A welcome email and newly generated password will then be sent out to the email address registered.