In case it helps any, I use Linux and no-script, -- photobucket lately has been changing things to make it hard for me to get the image link through their normal methods. Which I used to be able to do.
What I found as a workaround for me Is to just to right click on my image in Photobucket and select properties from my dropdown. This shows the Photobucket address for the photo -- I select that, copy it, and then paste it into my MadModders forum message.
Then to get it to display as a photo on our forum, instead of as just a blue link in my message, I select the address again and then click on the little "insert image" icon in the message composer window (4th button from the left, second row of buttons).
Also -- you do need to be in the full reply window, not the quick reply box, to see these button options on the madModder forum.
One other manual way to do this (in either quick reply, or full reply window) is, paste your photo link into the message , and then put the letters IMG enclosed in square brackets before the link, and /IMG in square brackets after the link. This tells the forum software that the stuff between those marks is an image, and to display it that way, not just display it as a link.