First, create a new document (File->New). It should be around 400 by 200 with 300 dpi.Now, create a new layer and type out what you want to be writen or drawn as your signature. Make sure it is all done in black. Example:Next you need to select that layer. To do this you hold down control and click on the layer.Example:and the image should now look like this:Now all you have to do is go to Edit->Define Brush and name your brush.You're all finished!! Your brush should be at the bottom of your brushes, or already selected. Try it out on some of your pics! It's a good idea to make the foreground color white or black, depending on the image color, and bring down the opacity on the brush when using it.Have Fun!!