To remove photos from your Aura frame open the Aura App and click into your "Frames" photos. Here is where all the photos that have been selected for your frame live.
To remove photos that have been individually added to your frame scroll to locate the photo in question. Next, tap the photo to view the photo details page. On the bottom right you will see the option to "Remove" the photo from the frame.
If the photo you would like to remove from your frame is part of a 'collection', tap into the collection and locate the photo you'd like to remove. Next, tap the icon on the top right (three small dots) and select the option to "Hide Photos". Check the photo/s you'd like to remove and click 'Save'.
If you require further assistance please don't hesitate to contact Aura's Customer Support by emailing firstname.lastname@example.org or calling 646-630-7237.