To attach images to a post, click on the "Additional Options" link below where you type your message.  This shows an "Attach" box and you click the "Browse..." button to select a file to attach.  If you want to add more images, click "(more attachments)" and more spaces will be added for you to add pictures.  You are limited to 4 attachments per post, and must add up to less than 256kb.

To make your images smaller use your favorite image editing program to shrink them down.  I recommend a size no wider than 640 pixels to fit comfortably on this forum.  Save the resized image as a JPEG image and you will easily fit 4 attachments in 256kb.

Hope this helps - let me know if you need further help!

You can also up load the pictures too somewhere like www.photobucket.com which is free then just copy the .img code and post in with your text, that way it will show up in the post with out having too click and open it.
Lars