Hi Steven, here's how I post pictures; I use imgur.com as a (free) file host. It can resize them for you.
Then use the 'Img' button above the reply box and paste the image url between them. I usually right click on the picture I want to show and select 'copy image location'.
It should look like this:
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[img]http://i.imgur.com/tM42U8b.jpg[/img]
Which will put this picture into your post:

You can use the preview button to preview the post as well, to make sure it will look ok.