To post an Image Link from another Web site or Page...Copy the URL to the image from the site you want to link to. Paste it into your message highlight the pasted URL, and then hit the little "insert Image" button (second to the left above the smiles) boom done....
If you are posing an image to these forums. here's how.
after typing what ever you want to say if you look down and to the left there is a "Additional Options" button which give you , well Additional options

here is where you can navigate to get your images uploaded

Click on it and the many options will Unfold. at the bottom of that will be "ATTACH:" which allows you to choose afile from your computer to upload.
Files are being toped out at 500k per image and 4 images per post just until I get backups set.