Replace rearbrakes on '93 olds achieva ,step by

Try 1993 Oldsmobile achieva fuse diagram Google Search

My info says under the dash to left of steering column.

From the fuel system troubleshooting guide - 1993 Oldsmobile Achieva

Inspect Fuel Pump Low Fuel Pressure.
Inspect Fuel Pump Relay - Faulty Fuel Pump Relay.
Inspect Fuel Injector Pressure Regulator - Faulty Fuel Injector Pressure Regulator.
Inspect Fuel Pump Strainer - Clogged or Dirty Fuel Pump Strainer.
Inspect Engine Control Computer - Incorrect Operating Information Being Delivered and Sent From The EEC.
Inspect Fuel Tank - Fuel Tank Empty.
Inspect Fuel Line - Fuel Line leaky/kinked/loose/disconnected
Inspect Fuel Fittings/banjo bolt(s) - leaky/loose fitting(s)

For your next posting, in 1993, Oldsmobile produced the Achieva with four engine types:
Available engines

• 4 Cylinders, VIN "3" 2.3L MFI SOHC Quad
• 4 Cylinders, VIN "A" 2.3L DOHC Quad 4 HO
• 4 Cylinders, VIN "D" 2.3L MFI DOHC Quad 4
• 6 Cylinders, VIN "N" 3.3L FI OHV

To find the engine type of your 93 Achieva, compare the 8th digit of your VIN code to the entries in the above table.

go under the hood to get to shift cable. what is the problem?

The service manual. But you could search the Oldsmobile, Cadillac, and Bonneville forums for info.
I did a 1997 Malibu and after removing the appropriate dash covers, you had to pull the instrument panel, which just pops out. Then you got to the switch through the opening.

electronic ignitions have none. the marks are made on inner componets for assembly only

sounds like ur torque convertor not unlocking u can unplug the wiring on the transmission for the convertor or pay alot money for having convertor replace cause u got pull the transmission to do it

it could be a sensor on the outside of trans

try junk yards .com
or go too e bay under auto parts then refine you search

Did you test the electrical circuit with a DVOM - digital volt ohm meter or were you just guessing an replacing parts ?