Mini-Map skin?

Hello, I need help with putting a texture/GUI type of outline for my mini map and I do not know how to do it. A step by step instruction would be most preferable but any help is welcome! As you can see from the picture provided, I have a PNG image file that I would like to attach to the pointed mini map in my game.
Thank you in advance.

I would import it as a gui texture, add it in game as gui texure, change scale on it, and drag it to the right spot. Do not parent it or it will move around a lot!