To change the cover photo for your gallery, simply hover over the image in the gallery you wish to make the cover photo and select the "..." button in the top right hand corner of the image. When the pop-up appears, choose "Set as cover photo".
To change the cover photo for your gallery, simply hover over the image in the gallery you wish to make the cover photo and select the "..." button in the top right hand corner of the image. When the pop-up appears, choose "Set as cover photo".