I can add/delete/modify reports only in my Developer folder. It seems like I am not able to add/delete/modify reports in any other folder. Are there additional requirements needed to have this ability? 

Report developers only have access to add/delete/modify reports within the Team Member folder for their department. If a report needs to be moved outside of these folders for use by others at the department they will need to reach out to their Controller or a report developer that has been delegated controller access. 

To obtain delegated controller access, the developer will need to contact their Controller and have them submit a request to CORE Help to provide delegated access for full control of the Department folder if they feel it is appropriate.