Add steps on how to assign deployment-only access

doc/ci/environments/protected_environments.md

@@ -129,8 +129,14 @@ to the branch deployed to it, are only granted access to deploy the environment.
 group with the Reporter permission, or in groups added to the project with Reporter permissions,
 appears in the dropdown menu for deployment-only access.
-Note that deployment-only access is the only possible access level for users with
-[Reporter permissions](../../user/permissions.md).
+To add deployment-only access:
+
+1. Add a group with Reporter permissions.
+1. Add user(s) to the group.
+1. Invite the group to be a project member.
+1. Follow the steps outlined in [Protecting Environments](#protecting-environments).
+
+Note that deployment-only access is the only possible access level for groups with [Reporter permissions](../../user/permissions.md).
 ## Modifying and unprotecting environments