BuddyPress.org

Super admins can edit any member profile by default.

When logged in as the super admin, check out the BuddyBar at the top of the site, there should be an “Admin Options” menu when you’re on a member’s page. Hover over this menu, next click on “Edit username’s profile” to edit the full profile of the user in question.

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For the “user notes” field, did a quick search to see if such a plugin existed, but could not find one. However, it shouldn’t be too hard to write such a plugin.