Short guide to posting pics on the Gridstream forum:
1. First you need some where to put your picture, like a free website or web hosting at a company. You can find a free website here:
http://www.freewebsiteproviders.com/ Unfortunately some website providers don't allow this kind of linking so the picture doesn't show up when you link to it. You'll have to find another if your first choice doesn't work.
2. Now you may need some software that will let you upload the picture to the site. You can try SmartFTP, it's pretty easy to use and you can get it at:
http://www.smartftp.com/ and it is free!
3. Create a link in your post on the forum by writing: [img]url%20of%20where%20the%20image%20is%20stored[/img] and that's all!
Example:

except with no 'spaces' between ] and [
Hopefully you are ready to share your pics with all the world

This guide should work on most forums I believe.