Adding a Reviewer to a Project is simple. First navigate to the project, then click People in the left sidebar and click the Manage button:
This will launch a new pop-up. You can then either use the dropdown menu to add an existing Reviewer (i.e., any user from within your organization who has previously used Bonfire), or you can invite a new user by typing in their email address:
Remember to assign the reviewers to the appropriate Evaluation Groups to ensure they'll have access to the right Requested Information and Criteria.
You can also click on the group icon on the left to add multiple Reviewers at once. This will allow you to invite multiple Reviewers by entering multiple emails separated by spaces, commas, or new lines.