Even Microsoft Paint would do it.
I'm having difficulty figuring out how to do it with Paint. Is there a quick procedure you can provide? Thanks in advance.
It's mostly math.
First, what's the pixel dimensions of the image (hopefully they match the ratio of the frame you're using)?
Then you need to figure out how many pixels it will take to cover the edges of the frame. Double that (you've got two sides as well as the top and bottom. So let's say your image is 2000x2400 pixels and the frame uses 100 pixels. Knowing that, your final image will need to be 2200 x 2600 pixels.
Load the image into Paint. Now press Ctrl+E. Enter 2200 and 2600 into the Width and Height prompts. This will expand the canvas, giving you a 200-pixel border across the right side and bottom of your image. Press Ctrl+A to select the entire image, then move it around until it's centered in the white canvas. Save As another filename (maybe ThisImageWithWhiteBorder.zzz) and send to the printer.