Problems in scheduler & auto update email

Hi, I’m new to this, currently having trouble in scheduler and creating auto update email.

  1. Scheduler after saving in 4 hours, it jumps back into 1 hour.
  2. I have edited the codes, but still showing codes in email instead of the info.

Code used:
Hi $user_first_name,
You’ve had an update to your case $acase_name (#$acase_case_number) on $aop_case_updates_date_entered:
$contact_user_full_name said:
$aop_case_updates_description
You may review this Case here.

Preview on email:
Hi Jasslyn,
You’ve had an update to your case New Application 6 Sep 17 (# ) on $aop_case_updates_date_entered:
, said:
$aop_case_updates_description
You may review this Case here.

Problem: case number, user full name, case update date & description not showing.

I have 0 knowledge in coding. Please help.