You can remove BBAutoComplete from the Dock using the free Dockless utility. You’ll need to make the Dock icon visible again in order to configure BBAutoComplete’s preferences or view its help pages.
If Dockless doesn’t work on your system, you can also hide BBAutoComplete’s Dock icon manually. Hold down the Control key and click on the BBAutoComplete icon in the Finder. Choose Show Package Contents from the menu. Open the Contents folder, and then open the Info.plist file. At the bottom of Info.plist, change:
<key>LSUIElement</key> <string>0</string>
to:
<key>LSUIElement</key> <string>1</string>
Then save the Info.plist file and relaunch BBAutoComplete. To make BBAutoComplete’s Dock icon visible again, change the Info.plist file back; that is, change the 1 back to a 0.