First you need to upload them onto a FTP server, If you have an account with AOL, Geocities, Fortune City, or any of the ones Pollo_loco69 listed (Theres hundreds of them out there that you can use for free) Then while youre typing your post toward the bottom click image and type in the full internet address for the pic.
Here is the internet address for one pic
http://members.fortunecity.com/bk4293/contour/Im000058.jpg then I clicked the image button and typed that in the little box that popped up to see this...
...And thats it. If you don't have a free web page or an account like this anywhere, E-mail me the pics and I'll throw them on Fortune City for you under my account so you can post them here whenever you want to.