3. If you are missing the Teacher role from the list, then have a word with your administrator. Ask them to give you the capability of assigning Teachers to your course.

4. To bring a fellow teacher on to your course, click on the Teacher role. You will then be presented with a split screen. On the right is a (potentially very long) list of Moodle users:

5. You need to move the users you want to be editing teachers on your course from the right-hand-side list of potential teachers to the left-hand-side list of actual teachers using the Add button:

6. If you can't easily find the teacher you need to add, then use the Search facility (under the potential users list). If the member of staff you need isn't listed, then they will need to have a login created...