Hello. It took me forever to figure out how-to post a flickr photo onto the SMS forum. For anyone that is having trouble figuring it out - here's what you need to do:
1. Open Flickr
2. Choose a photo from your photo stream
3. Click on the ALL SIZES icon (fifth in from the left - located directly above your photo)
4. Mine opens in large - I normally then click on Medium just so I can see the photo on my screen
5. RIGHT CLICK on your photo
6. Left Click on properties (the bottom choice in the pop-up window)
7. Now, you have a location. Copy the location (I triple click to easily highlight the long address)
8. Use CTRL + C to copy the location
9. Click over to the SMS forum page where you hopefully already have a topic just waiting for your image
10. Use CTRL + V to paste the image location into your SMS forum post - between the img on and off info and - you're done!

photo of a reversible headband I made from men's silk ties - this is the info between the image on / off code:
http://farm4.static.flickr.com/3122/2787579679_2553d7dae7.jpgHope this helps, Beth