How Can I Add Team Members Most Easily?

First, have team members register themselves by clicking Get Involved or Create New Account at OpenGreenMap.org/home. (You can do this by clicking Invite new members on a tab over your map)

You should login and go to the map you want to add them to, using MyOGM (or a direct link).
Click:

Map Team (tab over map)
Edit Roles (by any name on the bottom of this page)
Add Members (tab at top)
Type in their username, not their email, to add them to your Map Team.

Then click, Add Users.

Then, click Configure Member Roles.

You can make each a Team member (add and edit just their own sites), Coordinator (edit others' sites, too) or Team Leader (can make new maps, too). Give each just one role.

Click Save Changes.

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