Step 1
First you will need to go to the "Accounts" option and put the work order you want to remove access from into the search bar.
Step 2
Once you arrive at the work order page click the security option near the top of the page. Once there scroll to the "Users" options and click the box next to the name of the employee you are trying to remove. Now click "Remove Selected" and the employee should be removed from the work order.