If you look at the first post - the second picture after the first two videos , that's the cable you need.
You are using pwm , which uses a wire per channel.
(Not sure about the order of cables that is then mentioned - am used to throttle (
And power) being ch 1 , but if you use set up wizard on librepilot , should work in any order )
(( also - fao unmannedtech , subsequent motor order diag for quad is not what I'm used to - usually designated on LP as :