Interpreters: the Interpreter will need to be first promoted to an LSC Admin. To promote an interpreter to an admin, open their profile viewer. Click on the "..." icon in the top right corner, which contains additional actions. Click Make Admin.
LSC Admins: Yes, this can be done by from the Admin's profile viewer.
Click on the "..." icon in the top right corner, which contains additional actions. To make an LSC admin a Root Admin, click Make Root Admin.