Touch any area in the post that is not a media item or the Account profile image. This opens the post in full screen. Touch “Report” at the top of the screen and select the reason for reporting. Touch “Report” and then “OK” to send your report.
Steps: App
You will be required to not have Post Own Access
Touch an area of the Post that is not a media Item or Account Profile image to open in full screen
Touch the “Report” button at the top of the screen
Touch to highlight one or more of the reason fields