Okay... Well, when making an animated GIF in GIMP, each layer is pretty much a frame... so, in each "frame" you make the animation, and then when saving your work, your file extension should be .gif (so, like, example.gif). A window will poop up, click "Save an Animation", set the speed, and there ya go! If you want me to make you an animated userbar, I can give it a shot! ^^