i took a look at your video, you need to balance the tonearm and set the tracking force and anti skating.
the weight on the back of the arm is used to balance the arm....make it float level with the platter.
make sure the cueing lever is down.
this is for setting the tracking force.
this is for setting anti skating.
tracking force (VTF) is given by the cartridge maker, and the anti skate should be about the same as the tracking force.
this should do it for you, hopefully.