To add a new/remove a new user to the report group follow the below steps:
From the Main Menu select Advanced Report Creator.
Put in the password if one is available and take a look at the Groups on the right.
Find the Group you would like the user adding to or removing from.
Highlight the Report Group name and select the plus button next to Group Members to add a user.
Or highlight the Report Group name and select the cross button next to the Group Members to remove a user.
The user will need to log out and back into the Advanced Report Execution for the changes to take effect.