Automatic transmission Shift problem

didnt say if you have the manual or stick the following links should assist you
How to Change Manual Transmission Fluid Transmission fill plug altrenative ---http://geometroforum.com/topic/4334827/1/ https://video.search.yahoo.com/yhs/search;_ylt=A0LEVvnqgUlXbHoAnVsnnIlQ;_ylu=X3oDMTEyZnZrazdzBGNvbG8DYmYxBHBvcwM1BHZ0aWQDQjE4NjFfMQRzZWMDc2M-?p=1991+Geo+Metro+Transmission+Fluid+Check&fr=yhs-mozilla-004&hspart=mozilla&hsimp=yhs-004

You have a problem with the The automatic transmission shift lock control system, it is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components: as an example since you did not say the make, model an year vehicle this is from Buick service info . Do your brake lights work ?
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The automatic transmission shift lock control solenoid

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The automatic transmission shift lock control switch

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The brake to shift relay

Hi Judy , what kind of vehicle do you have ? Year an model ? ABS light has nothing to do with it not coming out of park . Problem with automatic transmission shift lock control ! Probably !
The automatic transmission shift lock control is a safety device that prevents an inadvertent shift out of PARK when the ignition is ON. The driver must press the brake pedal before moving the shift lever out of the PARK position. The system consists of the following components:
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The automatic transmission shift lock control solenoid.

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The automatic transmission shift lock control switch.

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The park/neutral safety switch.

With the ignition in the ON position, battery positive voltage is supplied to the automatic transmission shift lock control switch. The circuit continues through the normally-closed switch to the automatic transmission shift lock control solenoid. The park/neutral safety switch provides a path to ground for the automatic transmission shift lock control solenoid in the PARK position. This energizes the automatic transmission shift lock control solenoid, mechanically locking the shift linkage in the PARK position. When the driver presses the brake pedal the contacts in the automatic transmission shift lock control switch open, causing the automatic transmission shift lock control solenoid to de-energize. This allows the shift lever to move from the PARK position. When the shift lever is out of the PARK position the contacts in the neutral safety switch open and the automatic transmission shift lock control solenoid is de-energized.

you have a transmission problem your forward clutches may have to change,did you check the shift cable by the neutral switch if all those area check ok the transmission have to be repaired

1991 GEO STORM 1.6L 4-cyl Engine Code 5 DOHCCAPACITIES
Engine, with filter.......... 3.2 quarts
Cooling System, W/ MT Initial Fill.......... 7.4 quarts
Cooling System, W/ AT Initial Fill.......... 8.0 quarts
Automatic Transmission, Initial Fill........ 4.3 quarts [1]
Automatic Transmission, Total Fill......... 7.0 quarts
Manual Transmission, ..........4.0 pints[1] With ENG at operating temperature, shift through all gears.
Check fluid level in PARK and add fluid as needed.1991 GEO STORM 1.6L 4-cyl Engine Code 6 SOHC
1992 GEO STORM 1.8L 4-cyl Engine Code 8 DOHCCAPACITIES
Engine, with filter.......... 4.0 quarts
Cooling System, W/ AT Initial Fill.......... 8.0 quarts
Cooling System, W MT Initial Fill........... 7.4 quarts
Automatic Transmission, Initial Fill........ 4.3 quarts [1]
Automatic Transmission, Total Fill......... 7.0 quarts
Manual Transmission, .......... 4.0 pints[1] With ENG at operating temperature, shift through all gears.
Check fluid level in PARK and add fluid as needed.

I assume your car has a standard shift right now. Automatic transmissions **** up more gas than a stick shift, so I would advise you to keep yor standard stick shift. Just don't go around burning tires and try to keep your motor RPM's as low as possible.

have a good look at the gear shift linkage you may have it on rong

if you havent done it already replace the transmission fluid. it might help

Check the transmission fluid level. If it is low, fill it. Otherwise, if you happen to have a Subaru Select Monitor or equivalent, then you can read the fault codes for the 4EAT transmission and it will tell you which internal solenoid valves are sticky. At that point you can either add a quart of stuff that says it solves transmission problems and hope for the best, disassemble the transmission and change the problem valves, swap the transmission for one that works, or take it to someone to have it repaired.