First. The "burnt smell" should be a primary concern especially when it's accompanied by a mystery leak. The car probably has Power Steering fluid leaking onto an exhaust component. That's a recipe for fire and don't let anyone tell you otherwise.

Second. Don't use any sort of stop-leak or snake oil in the Power Steering system, normal PS fluid already has all the seal swell agents and/or conditioners that the system will ever need. If a seal or hose is so far gone that it needs to be artificially inseminated, it's too far gone.

Have this leak checked and fixed. A large amount of the Power Steering is either hidden from view or difficult to access, not usually an easy task in the driveway.

LUCAS power steering additive works well if you have rack seal that are leaking. The LUCAS softens the hardened seals. It takes a good 6-8 weeks to soften the seal enough to stop the leak. Problem is you can have a bad pressure hose or fitting and the LUCAS won't work then.

You have a bad power steering pressure hose, a very common problem on these cars.

you need to check the following components hose connections , pump shaft seal , input shaft seal , threaded fittings , rack end seals and bellows

check the pump and the steering rack

spray with water will turn white where leaks from

Chevy cavalier 2002, never see any stain/leak under car but have to add fluid weekly, burnt smell at times and high pitch squeaky noise when fluid very low. DOES THAT STUFF LIKE BARRS STOP LEAK OR LUCAS STOP LEAK REALLY WORK OR A WASTE OF MONEY ?