Do you need to edit the role of a member in your class who is in Invited state, before they accept the invite? Follow these steps - 

1. Tap on All Groups at the top left corner (on phone)
2. The left navigation tray opens up (on phone)
3. Click on the name of the class/community from the left nav.
4. Click Members
5. Click to expand Invited section
6. Click on the name/email of the member whose role needs to be changed in the class
7. Click Options in the top right corner of the Profile screen of that member
8. Click Role Type
9. Select the Role you want 
10. Click Save

Note: The role of the invited member is now changed . When he/she accepts the invite, they will be joining as the new role.