((Sorry, just gonna double post xD))

Start out with the UV.

Right click on the layer and hit "New Layer"

Don't mess with anything here except maybe the name, but make sure it says transparency. Hit OK.

Take the fill bucket and just fill up the entire screen on the new layer.

Lower the opacity (arrow points to it) to about there so you can see through to the UV.

Now it will be easy to add markings since you can see where everything is! Add your markings and anything else.

Change the opacity back to 100%.

Right click the layer beneath it and hit "delete layer". Now you will be left with just your base preset.

Go into your textures folder and find the fur texture. Click edit with GIMP or go into GIMP and open it up yourself.

Right click, go into "Edit", and hit "Copy."

Go to your preset, right click, go into "Edit", and hit "Paste".

It will look like this.

Go into "Mode", and click "Multiply", and tada~ You have a preset with a texture! Export it and you're done! :3
Hope this helps!