How do you remove the pnematic tubing from the fittings?p

I am trying to switch my tubing and I want to know how to keep the tubing fittings without breaking them

Push and then pull.

I don’t understand, push what?

Simultaneously push on the white/orange ring on the fitting and pull on the tube.

Yes. In this video, the ring or “collet” is greenish and the guy is pushing it back with his fingers.