Ubuntu 22.04.1 Jammy LTS Server Release Notes

Question: How do I change the hostname if I flashed the image onto an eMMC module? → Where does the user-data file live? and can I edit it from the CLI? or do I have to mount the eMMC drive to another computer and edit the file from there? if so, how do I mount the eMMC module?

Apologies if the response is very basic. I am just not sure.

Edit: I installed ubuntu-22.04.1-preinstalled-server-arm64+roc-rk3328-cc.img.xz on the eMMC 5.x Module and I used these steps Libre Computer AML-S905X-CC eMMC Flashing Steps from Linux to flash the module.