First thing to try is this: Set Up Sound - Zorin Help
In addition to needing to know which edition of ZorinOS you have, i.e. Core OR Lite? asked by Ocka, can you tell us what sound card that laptop has?
Spec for sound is not stated here. Jumper EZbook X3 13.3 inch Laptop N3450 8G RAM 128G ROM - Grey – Jumper Mall
EDIT: Just seen your other post.
From that do we assume you have Z16.2 Lite still installed?