Can you change the background on a picture with GIMP?

Mum needs URGENT help to change a locked desktop background picture!!!!!!!?

• My son has put a very unflattering picture of me pulling an ugly face as the background picture on my desktop. He has it tiled and flashing all across the screen.(of course, he thinks this is hilarious) The picture has GIFUP.com written on it. The problem is that he has somehow locked the picture on and it cannot be changed. The rest of the family, including grandmother, and aunties, have tried to get it off to no avail. Unfortunately, my soon to be disowned (!!!!) son cant remember how to get it off. Hopefully someone out there can help me....(and quickly for my darling sons sake!!!!)

• Answer:

  It would help to know what kind of computer you have. If you have a mac, go to Finder in the tool bar, then click on system preferences, and then click on background and screen saver. There might be a little lock in on of the corners click on it and have your son type his password. after that change it to whatever you want. If that doesn't work sell your son and use the money to get a new computer.