How can I make a border or frame in my photo?

Let's say you want to make a pillow out of this photo.

Start by tapping on the Edit icon (the pencil) in the upper left.

Let's say you're making a square pillow, and you choose Crop and the Square tool. Make sure that the child is centered, so you have room for frames.

Choose Frames from the Edit menu:

Try various frames until you like one, and then tap the Apply button.

Save the file by tapping the blue Save button, and then Save as a New File, so that you do not over-write your original photo.