When you want to post a picture, all you need to do is have the forum reply box open and photobucket open in another window. To insert a picture, first go to photobucket and click on the image you want to insert. When that image is open, 'right click' on the image and another menu opens up. Select 'Copy image location'. Now go back to the forum and place your cursor where you want the image to appear. On the tool bar, you see the mountain and sun icon that looks like this:
When you click that icon, another line opens up where you can "Control + V" to paste the image location in the forum text box. It just looks like a string of weird letters, but when you read the message, the picture is there. It sounds more complicated than it really is.
Good luck!