We get asked this question fairly often so I thought I'd write this tutorial. It's a bit long-winded so I suggest printing this out before you start.
First, images need to be hosted somewhere on the Internet and then linked to, as they can't be uploaded directly to the forum. To accomplish this, there are a number of image hosting sites on the Internet but most people on this forum use Photobucket to store their pics on.
You will need to register an account with Photobucket (it's free) so go to http://www.photobucket.com
and click the register now button. Choose your username and fill out the form.
Once you have an account you can log in and you will be taken to your default photo album.
Assuming you already have an image on your computer, you can now upload it to Photobucket. Note that Photobucket has a limit on the file size of images so if your image is larger than 1Mb it will be automatically resized. Click on the Browse button and in the box that opens up, navigate to where the file is currently stored on your computer. Click open.
Click Submit and the photo will be uploaded to Photobucket. If you are on dial-up this may take a few moments.
When successfully uploaded, a thumbnail of your image will be displayed at the bottom of the Photobucket webpage.
Notice that below the image are 3 rectangular boxes named Url, Tag and Img. Click in the Img box and the text there should turn blue. Now use the right mouse button to click on the blue highlighted text and from the popup menu that appears choose Copy.
Now you need to open a new browser window and navigate to the kintyre forum. Write your message and at the point in the message where you wish the image to appear (probably on a new line) right click and from the popup menu choose paste. This places the link to your photo into the message.
At this point it is worth clicking the preview button to see how the photo looks. If it is too large, and many are as modern digital cameras take very large photos, switch to the Photobucket browser window where you will be able to resize the picture using the Edit button that is just above the image. It's best not to resize the image smaller too much as you cannot resize it larger if you make it too small. Try 75% of the original each time till you are happy. Check how it looks after each resize by switching to the forum window and clicking the refresh button.
When you have successsfully resized your photo to fit onto the forum, you can finally submit your message.
Important: Remember that for your photo to show up on the forum you should not delete it from Photobucket.