Looking for some guidance on the execution of scripts

I am looking to install nextcloud in its own jail using the directions and script at: GitHub - danb35/freenas-iocage-nextcloud: Script to create an iocage jail on FreeNAS for the latest Nextcloud 28 release, including Caddy, MariaDB or PostgreSQL, and Let's Encrypt

Could someone please explain how to complete the step “Then change into the new freenas-iocage-nextcloud directory and create a file called nextcloud-config with your favorite text editor.”? I just genuinely do not know what I am doing, videos and screenshots are appreciated!

You navigate the file system by the cd command.

So, SSH into your TrueNAS box. That will take you to your root filesystem.

Once that is done, you cd to a directory where you want to store the script.

cd /mnt/yourpool/scripts

From there you can copy the clone command and continue the install.
Once you have cloned the directory and ran cd freenas-iocage-nextcloud to enter it, you can create the config file by edit nextcloud-config

Follow the guide to enter your IP and whatnot, then hit ESC and make sure to the hit the “save” key. It will ask you once you hit ESC.