After i download one of the sound fonts from this list how to i properly load them onto my diamond saber?
Sorry to be THAT GUY, but... have you read the instructions that came with your Diamond saber? Have you followed them and downloaded and installed the software on your computer? Have you downloaded and read the manual for that software?
If you haven’t done that, we can’t help you; there are just too many possibilities. If you
have done all this, and it still doesn’t make sense or it just isn’t working like you expect (which is certainly possible), then please come back here with some specific questions about what doesn’t make sense, or what isn’t working for you.