This is an easy one! Here are the steps:
Simply open the menu on the top right hand side of the image.
From there, you can control the order of the photo amongst the others or you may delete it entirely.
Typically, photos of the exterior go first, followed by interior images. Make sure the areas of your home that are your "stand out" rooms are positioned at the beginning of the order. For instance, you may want to show images your newly renovated kitchen first.
Make sure to put the best image (the "Cover Photo") up front. We use this photo for advertising your home!
Keep all of the photos of a room or space together and move from one floor to the next in an organised fashion so potential buyers can get a sense of the layout.
Be sure to write a brief caption for each photo. Point out key selling points in the images that are subtle or might be otherwise missed.