I always make my pictures the size I want on my own computer before saving and then uploading to the photobucket...and you can use whichever of those 2 bottom links..I usually use html or the IMG one I copy and paste it exactly as is in the box they put it. I see you were able to do it~~ have fun.
If you ever want to see how someone posts theirs on here you can always go to their edit box and click on it and see how they did theirs. That's how I learned most of my html language on here years ago ( although today it may be a bit outdated
Great White North