Ah, a good choice of site, Reb.
To upload pictures:
At the top of the page, you should see a button which says 'browse'. There may even be three of them, one on top of the other. To upload a picture, click on 'browse', and then locate the picture you want to upload on your computer in the box which appears. Once you've done that, click the big 'upload' button. Done
To get pictures from Photobucket to here
When you're on the main page (the same page where you clicked 'browse' and 'upload'), scroll down until you see the picture you recently uploaded. Underneath it, you'll see four fields (Email&IM, Direct Link, HTML Code and IMG Code). The one which applies to this site is 'IMG Code'. To get the image on to here, all you have to do is copy everything in the 'IMG Code' field and paste it where you want it to be in a reply on here. Just like this...
(My old man at the Grove).
I think that should cover it. Let me know if you need help with anything else.