Configuration help apm 2.6

Hi I introduce myself, I am new to the world of drones. I have ridden a F450 with controller apm 2.6, GPS, telemetry and power module, I’ve flown with him on several occasions, but want to set the failsafe do not know what parameters have changed now not assemble the engines, it seems that activates a failsafe and not linked to the droidplanner. Forgiving for possible misspellings, I’m using a translator, my English is null. Thanks in advance.