You will need to host your pictures somewhere. I use villagephotos.com It is easy to use. You will have to make an account there, then you can upload you pics right from your computer to there. You do that by going to "photos" at the top of the page, then "upload (browser based). That lets you look right on your computer for the pics you want to upload. Once you have pics on there it usually defaults to unsorted which is down below the upload.
Click on unsorted and find the pic you want. At the bottom of the pic it will say "View and Manage Image". Click on that and scroll down to the "Direct Url" code. It will read something such as
http://img.villagephotos.com/p/2006-...76%20small.JPG
Highlight all of that, right click and copy it. Go back to the forum, click post reply and above where you type your reply you will see a radio button that says "Img" without the quotes. Click on that, then right click and past what you copied from the photo site, then click on the red words below "Img" that says Close Tags. Submit it and there you go.
This sounds complicated and there may be an easier way but I know this will work.
Curtis