Admins can adjust what activities different roles can complete on a workflow. To edit these permissions navigate to the 'Workflows' page under the 'Administration' tab. This page lists all of the active workflows on the platform, select the specific workflow you would like to edit using the 'Edit; button on the right-hand side of the screen. Navigate across to the 'Roles' tab, you will have the option at the bottom for a 'New Role'. After clicking on this button you will be able to configure your new role.
