Sorry I haven't figured that one out. However, try what this thread says to do:

1. Register at http://www.zedge.net.
2. Once on there, set your phone to the Instinct m800.
3. Download whatever wallpapers from the site.
4. Register at http://www.myxer.com.
5. Try to upload the stuff you downloaded from zedge to myxer, and as you do tell it to send it to your phone instead of saving it.

Additionally, if you save to the same format your phone takes images in, you can set whatever image you get as the wallpaper. If the first steps don't work I suggest doing this instead. Just remember that the screen area is 240x400 if you're interested in reducing file size for other better things.

After a little messing around, you can find or make any image work. Turn it into a jpg, making sure it's those dimensions. Center it as you're turning it into wallpaper.

Check out   www.funformobile.com          Totally FREE   ringtones, wallpapers and more.

Not a scam either. I was skeptical at first when a friend told me about it. But I had to try it.
So I did and I'll be damned.  It really was what they said.  LOL.  Anyway go there  from your mobile
and download straight to it. Or you can go on your computer then enter a code from the website to your phone and get em that way. I prefer doing it with my phone.   Have Fun.

what ever  im just trying to help others out the way ive been helped u can check it or not i dont care thats your choice     ive gotten ton of tones with no stipulations so do what u want.