If you dont have photoshop and only have paint.net what you need to do is download a plug in for paint.net.
Click here to download the plug in.
Instructions how to download itOpen the zip folder that you downloaded copy the file inside of the zipped folder
Go to My Computer, then find C Local Disk
Find Program files,
and find Paint.NET, and find effects, when you do that paste the file in there
If you have paint.net open while you install it, close it and open it again to access it.