press brake pedal down and move lever while depressed. this is a guess because you dont mention what year it is.
truck start shift is hard to move in gear
You've probably torn the transmission up or broken a shift lever by abuse. At least, somebody did.
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Stuck brakes, broken axle shaft, failed transmission....
move on change gear ect.
check the brake pedal switch
depress brake pedal
gear shiftner will not move out of park
The gear stick has a diagram of where to move the stick to engage a certain gear. For example, if Gear 1 is in the top left corner, you must move the stick to the fair left, then forwards to engage first gear. Oh, and you have to push down the clutch each time you change gear.
There is a plastic piece inside the gear shift console that breaks and makes it impossible to move out of park without special effort. Do not try to force the gear shift or you will just make things worse.
You must have the key inserted and in the "on" position to move the gearshift. Check this first!!! Might be a bad clutch cable as well.
Bent shift linkage Frozen shifting linkage - try lubricating