(right click mouse, then select copy by the text)
6. Now right click your mouse, and "paste" that text in while editing or posting a new thread/post.
It's even easier (I'm lazy) to highlight the code with the [img] tags and then copy it by hitting ctrl+c, then you can paste with ctrl+v.
You can also use pics from other people's albums the same way, just copy/paste.
Photobucket can also edit the size of the pics so you don't post something that stretches the screen and make the thread annoying to read, just click the "edit" button. You can also re-size pics as you upload them from your computer, there should be an option in the "Upload images and video" box. I think 800 x 600 is as big as you'd want to go, may depend on your monitor though, I use a laptop.
You can upload multiple pics to photobucket by holding ctrl as you click the ones you want.
If you move the pic to a different sub-album within your photobucket it could break the link and make it not display in your post. This means it's a good idea to organize your stuff as you upload it. For example, in my photobucket I have an sub-album for Nerf stuff. Makes it easier to find the pic you want to post if it's organized.
It might also be good to note that if you do it like Mega says you don't have to use the "insert image" button in the reply screen because all it does is add the [img] tags, which will already be included when you copy/paste the proper code on photobucket.
/random things about photobucket