I have a 4.6 motor 4x4 1998 ford f150 truck how should i use the overdrive button on shifter handle?

I have a 4.6 motor 4x4 1998 ford f150 truck how should i use the overdrive button on shifter handle? - 1

Floor it and if you want to go faster, hit the button.

Its only needed when pulling a trailer or when going up a steep incline. Just disengage.