Hibernate - Oob missing?

[Forpli]

How to create SWAP partition after installation:

Create a swap partition on already existing drive with zorin os installed

When installing Zorin I have set the installer to manually install stuff, and followed through the zorin guide except I must have missed creating a swap partition. As such today I noticed Linux can act wonky under heavy load (16gb of ram), and can also behave weirdly after waking the computer on when using the suspend mode. As such, I would like to know how to safely create a swap partition on an already existing drive with zorin without data loss.