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You create each frame/message as a GIF image in another program, and then import the images into GifBuilder to "assemble" the animation.
Ahh, but it seems to only be available for Macintosh! Oops.
I've had good luck using other CoffeeCup (www.coffeecup.com) software for Windows, and they put out CoffeeCup Gif Animator for Windows 95/98/NT/2000/ME.
You can also search Tucows for the words "animated gif" (without quotes) to find other programs for your platform.
Aside from a number of many gif-only editors, Macromedia's Fireworks will be the go-to app I think.
You may even be lucky enough to download a functional demo from Macromedia directly. If not, it's not expensive, and well worth it if you'll continue this type of production in the future.