Watermark for my Photos

OK I tried to watermark my photos using GIMP. I'm not sure if I really really like how they look. I ended up just making it like a gray, I think? I don't know. I used this e-How website, but I couldn't complete it fully or save the text so I could use it again.

This is Sally Hansen Nail Prisms Purple Diamond 3 coats w/basecoat and topcoat taken in the sun.
My index finger is a little messed up.

Is there an easier way to watermark? What are your suggestions/tips.

In other words HHHHHEEEELLLLPPPP!!!