The lever grease gun is easy to operate and is available in a variety of styles to meet different needs. How to use: 1. Turn the head of the gun away from the barrel. 2. Pull the piston up to the top. 3. Insert the open end of the grease barrel into the tube to fill with grease. 4. Screw the head and barrel back on. 5. Pull up the piston and then quickly lower it. Repeat 2-3 times, this will help to compress the butter.6. Then crank the head handle to use the butter.7. If your gun is still not working, this is because there is still air inside the gun, just turn the head bleeder screw to bleed the air.