The dipstick for the automatic transmission fluid on a 1996 Chevy Cavalier 2.2L with a 4-speed automatic transmission is
located on the driver's side of the engine compartment, near the firewall. It's usually a bright yellow or red handle sticking up from the engine. It might be somewhat difficult to spot as it's often tucked in between components. Look closely near the back of the engine.
If you're having trouble finding it, a quick online image search for "1996 Chevy Cavalier 2.2L automatic transmission dipstick" might help visualize its location. Remember to check with your owner's manual as well, as it should have a diagram showing the location of all fluid level checks.