Creating borders.

I need help with something on Adobe Photoshop Elements (obviously). Well, I have these images and the only thing I want to do is but a 1 pixel black border around the image itself. Say the image is a square shape, I just want the edges to be bordered in black. I tried select all and then modify border, but then no border appears. If anyone can please help, I would really appreciate it, as I am new to this software.

I know absolutely nothing about Photoshop Elements. In the "normal" Photoshop you would first select all. Then instead of choosing "border" select "contract" in the Select>Modify menu. Next Select>Inverse and you have your border. You can now paint of fill you selection.

I hope this works in Elements too