How to put Watermark Signatures on Photos

I bought two CUTE watermark signatures from digidesignhouse and I learned how to PUT them on my photos today!  How awesome is that! Check this out:

I received my watermark signatures via e-mail. I asked a couple of my friends how to put the watermark signatures on my photos. My friends recommend gimp.org. {Thank u!} I did the "free" download on gimp.org and then watched a great tutorial that walked me through the process! YaY!