What’s the best way to add read write and execute permission to a folder for a user other than root within a mounted drive?

I took a look at https://superuser.com/questions/235297/allow-specific-user-permission-to-read-write-my-folder/235398#235398 and I’m not understanding how to modify the instructions given by DO to fit what was provided in the answer to the question.

mkdir -p /mnt/staging_nyc1_volume_01
mount -o discard,defaults /dev/disk/by-id/scsi-0DO_Volume_staging-nyc1-volume-01 /mnt/staging_nyc1_volume_01
echo /dev/disk/by-id/scsi-0DO_Volume_staging-nyc1-volume-01 /mnt/staging_nyc1_volume_01 ext4 defaults,nofail,discard 0 0 | sudo tee -a /etc/fstab