Don't know if anyone has mentioned this yet or not, but if you just want to very quickly upload a pic and post on forum, try Imgur.com It was created to make sharing pics on message boards like this extremely simple.
Here's all you have to do:
1) Go to Imgur.com
2) Under the word "Upload" select Web or Computer
3)Click Start Upload
4)Look to the right side of the screen then copy and paste the link generated under the headding BBCode (Message Boards)into your TFF post and your pic will appear.
Keep in mind that the free version of Imgur may not keep your pics forever, so if you want to always have an online copy the other sites like photobucket can be better. But just to toss up a quick image you don't care about keeping on your TFF posts, Imgur is the easiest I've found.