There are 3 main ways of adding images to your posts on the forum.

1. Upload a file from your computer as part of your post.
If the image file you want to add is under 300kb then this is probably the easiest way.
To do this you create your message as normal but then further down the page there's a section entitled "File Attachments" with a browse button. Press browse and find the image on your computer, then submit your post as usual and the image will get included.

2. Link to an image that you've put on the internet somewhere.
For bigger images you'll need to go this route that involves getting the image onto the web somewhere and linking to it. If you have webspace through your ISP you could upload the images there, otherwise you'll need to use one of the online photo storage sites.
Knighty wrote a bit of a guide to doing this using Photobucket this here
There are plenty of other free image hosting sites as well, for a list with reviews look here

3. EMail them to me and I'll add the pictures.
Please ensure the file sizes aren't too huge. If you need to send more than a couple of megabytes then drop me a note first and I'll give you a different email address to use.

Cheers

Paul