Sandy,
The lube goes in the little silverish screw off cap on the bottom of the motor on each end. You can see the pully end one just behind drive wheel. There should be a wick inside. I haven't pulled mine out yet so I'm not positive on that.
The screw slot deal on the top rear of the motor is the brush cap. No need to mess with that as long as the motor is running good. There is one top and bottom.
Joe