Trouble scanning on HP 3051 and OS X

I've got my printer scanner, copper properly installed, but I can't seem to figure out how to scan a document. I'm on a Mac mini and use OS X 10.9.4. Before my laptop died, I had an icon in the dock that I could simply right click on and there you'd go.

Question by Mark Kerrigan on Super User, licensed CC BY-SA. We show a short excerpt and link to the original thread as credit.