If you are selling or posting your photos online you will want to add a watermark.
There are different ways of doing this but I wanted a quick way and one that I could use repeatedly without having to redo the steps.
Here is a tutorial for creating a watermark brush. http://everydayelementsonline.com/2011/02/create-a-watermark-brush-in-photoshop-element/
Other watermarks include information in the design but I haven't yet gone into that as it seems to be a bit of a process.