gunsmoke - we have to limit the size of uploads to TFL both for storage space reasons and so that our members don't get hit with multi-megabyte images to view.
There are several things you can do to fix the problem:
Take any images you want to upload in a smaller format. All digital cameras give you a choice of image size to use.
You can resize your images with any of several available applications, for example, IrfanView ( irfanview.com ) or Microsoft's Paint.