If you go to the Image Gallery Forum there are several posts about how to post pictures, but here is a quick break down....
1. Your picture must be on the web (anywhere)
2. Then when posting your picture click on the "Img" button then insert the web address/property of your picture, then click on the "Img" button again.
You can also add a link the same way but click on the "URL" instead.
If you have a website that you can post on it is great, if not many of our members have sites and will host some pictures for other members, you just have to ask!