Default Reviewers: any internal project team member(s) that should be notified as well as be responsible for reviewing any Change Orders sent to your company on the selected project.
Select Project > select Project Settings within the project drop-down menu > click Change Orders
Click Edit at the bottom of the screen
Select the on-system default reviewers. If you do not see the name of the employee, enter their email address. The employee will receive an email invitation to join your Workspace and work on the Project.
Configure Project Pay Application Settings