To create staff roles (different from trainer/instructor) click on Reports -> Back Office -> Roles. Roles are necessary to schedule staff's shifts.
Click on Add to create a new role and click on Actions to Edit or Delete it.
If a role is no longer needed, you can click on Actions -> Edit and mark it as stored rather than delete it, so that all the related records won't be los. The system will carry out this operation automatically at any deletion attempt in case the role is linked with shifts. An icon with a padlock will indicate that the role has been stored.