This thread will describe how to post pictures from a photohosting site, from a PDF file, or from some other location on the web.
First, though, where are your pictures? If they are on your computer only, you will need to upload them to somewhere on the web for the rest of us to see them. I upload pictures to PhotoBucket, but there are other photo-hosting sites available. For example: Picasa, Filckr, Webshots, Snapfish.
Open an account w/PhotoBucket or other photo hosting site.
Take a picture using a digital camera (or film camera, but get your pictures on a disk when they're developed & download them to your computer)
Resize your pictures so they're not too big, generally no more than 400x300 (or 300x400)
Resize keeping the same proportions so they don't get distorted...i.e., don't specify a specific size, use %-ages or similar
[You can also often resize pictures at your photohosting site, but it's faster to do it on your computer]
Upload your pictures to your photo account
Find the label that contains the HTML Code link to the picture and copy it
Paste it into the thread's "Message" box ()
Click the "Preview" button.
You will now see the picture.