Google Flickr and set yourself an account up, it is free for so many pics.
So, you have your flickr account here is how too link from there to here:
First, upload your pic
Select the folder and pic you want to upload
Once it has uploaded and you have watched an annoying ad,click the add description bit
Add a bit if you want here
Then click save.
Your pic will now be on your Fickr page, or in an album if you choose one.Next up,click directly onto the pic
This pops up, cick the share button
Make sure the BB code point is clicked, then right mouse button click in the code, it will turn blue,select copy.
Paste that into the thread you want and all will be revealed
Make sure you resize your pics to 1024 on the longest side, makes the whole process faster, better and easier for the forum.
Flickr Test by Fracster, on Flickr