If you haven't figured it out already, I have your solution:
Follow me in color order:
GREEN: Choose a file you will be prompted to a directory search on your computer.
YELLOW: The window of the directory should look familiarly like this (But with your computer files listed). Choose your image and proceed.
RED: Once you see the files name and it's checked off on your main photobucket account's upload box, proceed to click on the "upload" button. They also allow you to upload multiple images.
BLUE: When your file or image(s) has been successfully uploaded, you will see a thumbnail view of your image; along with other images you had uploaded. Now below your images you will see:
Email & IM [
http://blah]
Direct Link [
http://blah]
HTML Code [
http://blah]
IMG Code [
http://blah]
- Click on the special html address that you see for "IMG Code". What that is, is a custom html code and you use that custom code to paste or post that into the "reply box" on that forum you are trying to post on ; such as this.
Purple:
After that, you should have successfully posted your image onto the forum.