Once you've set up your Evaluation Groups, you may want to add or remove Reviewers from each group. You can make these changes under the People section of your Project Details page. Under the People section, you can see a list of all internal users associated with your project as well as a quick summary of which groups they are assigned to:
If you would like to add Reviewers or edit the groups they are assigned to, click the Manage → Reviewers button:
In the Manage Reviewers popup, you can then add/remove Reviewers and assign them to the appropriate Evaluation Groups:
Do note that Reviewers aren't able to edit or take over other reviewers' scores, but you can edit evaluation groups to remove and add reviewers as needed.