In order to see the Position History button on an employee's profile you will need the permission Position History.
Your manager or any System Owner user can add this for you by going to your profile and then following the steps below:
Click Security, then Permissions.
Click Edit Employee Permissions.
Search for Position History.
Click the eye icon to set it to green.
Click Save.
📌 Note: The permission can also be added to a role or post by following the steps in our article on adding permissions.