How do you add transmission fluid to your '92 5-speed Geo?

Assuming this is an automatic transmission, the transmission dipstick tube is where you would add Transmission Fluid. After a drive and the engine and transmission are warmed up, put transmission in the park position, apply parking brake, leave engine running, exit vehicle, open hood, locate and remove transmission dipstick, wipe dipstick dry, reinsert dipstick completely into tube and remove again. Notice the level of fluid left on the dipstick, it should be within the marks indicated. Add the proper fluid as required thru the dipstick tube if needed.

If this vehicle has a standard transmission the fill plug would be located under the vehicle directly on the transmission. This would best be done on a lift. With vehicle up on a lift and level remove the fill plug from the side of the transmission. The fluid should be right at that level of the openning, add the proper fluid if necessary.