TotalFinder not working automatically

When I boot up my iMac pc, TotalFinder doesn’t run automatically. It only works when I launch it manually. I tried uninstalling/reinstalling it and still doesn’t work. What’s wrong? FYI: My iMac specs - OS X Lion 10.7.5, 8GB 1067 DDR3
memory and a 2.66 GHz Intel Core 2 Duo.