You can either post them right here on this thread or post them in the "Photos" section(in the blue region on the left).
Posting within this thread is easy...Under where you type your messages is a section titled "Attach file:" by clicking on the "Browse" button you can locate the files on your machine and attach them. The only requirement is that the files be smaller than 640X480 pixels.
If they are too big you can resize the pictures in MS Photo Editor or other similar photo software you may have(like Paint). Open the pictures and under the "Image" menu you will find "resize." Use this feature to reduce your pics to 640X480 or smaller and then resave under some new name(so you don't overwrite the original.) Then post them here!