Try reducing the size of the photos, here's how:
It seems like every computer is different, but basically you need to right-mouse-click on the photo, and select the "Open With..." option. Then choose the "Paint" program, which is pretty basic, but will work fine.
Then choose "Resize" and make sure the "Percentage" and "Maintain Aspect Ratio" boxes are checked. Depending on the size of the original photo, you might have to choose a number like 25 percent to get the photo small enough to fit within the BIT limit for posting.
Experiment a little bit. It's not that hard, once you've done it a time or two. Hope that helps, good luck!