HELP...Motor Beeping pixhawk

Hello, i have hooked up my pixhawk, everything else seems fine on mission planner, main light is flashing green. However I have my motor beeping about 2 times a second ish. I have read some trend they said change the PWM to 1500, but how do you exactly do that? I’m new to this and thanks for all the support!

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The motors beeping is normal and indicates that the ESC’s are not receiving any PWM input. Until you push the Red flashing button no PWM is output to the motors for safety reasons.