Create Admin Roles in Management Portal
Read this to learn how to create Roles for admins, which will define which activities they'll have access to in Management Portal. You should do this before inviting admins.
What Admin Roles are in Management Portal?
Read this to see the list of all the activities that can be added to Roles. Roles define which activities an admin has access to in the portal.
Invite Admins to Management Portal
Read this for instructions on adding admins to the Management Portal.
Resend invitations to Management Portal Admins
Read this to learn how to resend invitations to admins if they lose theirs or have trouble logging in.