Open Scale Auto in (SA) one window, Photobucket (PB) in another.
In the SA window, start a topic or reply to an existing one. When you get to the area where you want to post a pic, pause and switch to the PB window.
Select the image you want to post. On the right hand side there will be a box with Direct, Url, etc. Place the cursor in the text to the right of Direct and left-click once. You will see "copied" with a yellow background (at least it's yellow on my browser) temporarily displayed. Return to the SA window.
If you hover your cursor above the icons, you'll see the purpose of each icon; select the one that says Image and left-click on it. Place your cursor in the URL portion of the window that popped up, left-click, and, while holding the CTRL key, press the letter V once (the CTRL V is a Windows shortcut for the paste function). Press the space bar once (to prevent any follow-on text from appearing as a link) then press the Enter key.
Ta Da, you're done.