How do I change lawnmower string?

I have already taken off the top part of the plate cap.
How do I re-thread the string- Murray 20" self propelled 5.5hp
Quantum throttle- free design
Anthony Perry, July 2005
spring needs to be titen befor you put the rope in then it pulls the rope in

Allan McCleary, September 2007
spring needs to be titen befor you put the rope in then it pulls the rope in

Allan McCleary, September 2007
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