To get started, you need to open an accountant on Photobucket.com. It's free. Once you've done that, you load your pictures to your Photobucket file, and from there, you can post them in your threads or where ever. If you need help after opening the Photobucket account, let me know.
Click on Browse. Choose the photo from your computer that you want. Then click upload. Pick the "url jumbo" for forums. It will copy it for you and then you just paste it into whatever thread you are creating. It will show the pic instead of the "url jumbo" after you submit your new thread or post.