I hear this question a lot: "How do I give someone a hidden instructor rights so they can get into my Moodle course site?" It's easier than you think.
-Go to your Moodle course site
-click "Assign Roles"
-click "Instructor"
-type the persons name into the search box and click search
-Highlight the search result (it should be that persons name and the email)
-Check the checkbox above the "Add" button and click "Add"
-Finally click "Assign Roles" at the bottom of the page.
That's all there is to it.
-Go to your Moodle course site
-click "Assign Roles"
-click "Instructor"
-type the persons name into the search box and click search
-Highlight the search result (it should be that persons name and the email)
-Check the checkbox above the "Add" button and click "Add"
-Finally click "Assign Roles" at the bottom of the page.
That's all there is to it.
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"Moodle: How to give hidden instructor rights"