You have the job leave signature message set to ‘Yes’, this means you will not be able to edit the job feedback report once the event is marked as left.
If you do wish to alter the job feedback report, this can be done on the web by viewing the diary event, then tapping the feedback tab at the top of the side panel and selecting edit in the required sections.
If you wish to edit the job feedback report on the mobile app after its marked as left, you will need to set job leave signature message to ‘No’. Please see this guide on how to do this: Job leave questions