Moderators also can be assigned at the top-level or within a specific subspace.
Moderators can:
Edit or delete posts and comments
Inside your top level space (program/community “container” space), click on Manage button:
The General Settings section will open.
Use the bright blue “Invite” button as if you were inviting members to your program/community:
Within the invitation menu that opens on the left, type their email address in the first field, add an optional welcom message and choose the role:
Even if your program is paid, you can create an individual free invitation to any person by putting 0 in the price field. See here:
Within Manage settings, go to Members section.
Locate the person and change their role from Member to Editor: