How to make a border on your pictures

Add caption

You have to ensure that the Auto select and show transform are both ticked to ensure you can choose and change the size of your image.

I screen grabbed this to show how I changed the size of the image.

When I re sized it to the size i wanted i then got another picture i wanted and went on Edit, then transform, I clicked again for each picture so they would match the size. 

I then clicked the picture and zoomed in to make sure that they were all align with eachother.

After I had aligned the pictures together I then went on edit, stroke.

After clicking stroke, i chose the colour black for the border, and then changed the width to 20 and screen grabbed then pressed save.

This became the final effect.