1. Open up to any pattern that you want to add/install. The one below is offered on this site.
2. Now click on the arrow on the side of one of color selection rectangles and select the pattern option.
3. A pattern will now appear inside your rectangle. Click inside the regtancle and a frame will pop up.
Click in the preview square of the pattern inside the frame to access all of the patterns you currently
have.
Look at the very top of the list with the different patterns given to you.
Select the pattern you have just loaded and you are ready to use it!
3. If you wish to add more patterns, just repeat all of the steps.
Remember that your patterns may not be saved for future use depending on your PSP version.
This is more of a quick way for one time use.