I set up my PC with Zorin OS 18.1, have been so busy I haven't touched it for 3 months and I can't remember my password. I've tried the method of going into recovery mode but when I type
"mount -o rw, remount /"
I get "mount: /: special device remount does not exist."
Please help! I'm super new to this stuff and this is beyond my understanding.
You're not using your command. The proper syntax for Zorin OS recovery is mount -o remount,rw /, without a space after the comma.
However, if it still indicates that the device doesn't exist, you're most likely not on the true root filesystem yet. Therefore, before using passwd username to change your password, run lsblk and remount the appropriate partition using mount -o remount,rw /dev/sdXY /.