Where are the lifts and how do you remove or clean?

Hello,

What is the issue with your engine?
Noisy valve lifters?
Valve train noise is often caused by bad or low engine oil or sludge/carbon build up.

A good video explaining noisy valve lifters:
https://youtu.be/QfSDx5Odh3o

A good video showing hydraulic valve lifter change on a GM, Opel engine. Very similar to your engine:
https://youtu.be/x9FnwIovN9I

The hydraulic valve lifters are located inside the cylinder head underneath the camshafts.

Your vehicle is equipped with a 1.6L 16V DOHC engine.
Meaning dual overhead camshafts with 16 valves, therefore 16 valve lifters.
See image 1+2 below.
To access these, you will need to remove both camshafts.
See image 3+4

Hope this helps.

Cheers, Boris