It depends if your car/truck has four-wheel drive or not (all four wheels turn, when shifted). First, if you have a manual transfer case, then you should be able to pop it in to neutral, and push it where it needs to go. If you have a Chevy pickup, then put in you're key till everything, but the engine works, and press the button on the left side of the steering wheel.
If you have a stick-shift, then open the clutch, and just take it out of gear. If it doesn't move, then check the p-brake. Note that this will only work if you have a pickup truck, or an old model car (2006 or older) This will not work for awd cars like subarus. It's either that, or you could just detach the axle from the transmission/transfer case, tie it up, and start pushing. More work than needed, but it works.
Align the neutral lockout switch.
The engine needs good battery power, fuel and spark to start and run. You are probably missing one of those.
Key won't turn or it does and the engine won't turn over?
seized engine? defective or disconnected solenoid? starter not grounded? starter is engaging a damaged gear?
The clutch is master and or slave cylinder are bad
Align the neutral lockout switch.
It needs to be in park or neutral to start. All cars have a "safety" switch which prevents starting in gear.
need more info.year,model.
it wont change gear properly. if at all,,, because of the oil thickness
You need a new tranny...
broken stsarter or ring gear.
If your speedometer isn't working then that gear needs replaced before it'll shift
Make sure the sidestand is retracted.
The shift cable runs under the drivers side carpet. After many years of moisture and corrosion the cable seizes up and you can't move the shift into gear or it moves with great difficulty.
You can also start a car in Neutral. Also remember to put your foot on the brake too.
There's sludge or bits in the valve body.
I know that my 1995 XLT has a brake interlock switch, that doesn"t allow my automatic transmission to shift out of park into gear unless the brake pedal is depressed - I don't know if that is what your problem is.