To use the HR module there are a few steps to configure.
To enable the HR module, activate this as a module under Setup/Settings/General page, in the Modules section.
Add HR to the group of users that should have this access
Select the node that the group should have access to
Each of the approval roles can be activated separately. This means that one does not need to use HR for all approval.
Select to use HR time registration approver in the Setup/Settings/General page, in the Time records section
Select to use HR absence approver in the Setup/Settings/General page, in the absence entries section
Select to use HR travel and expense approver in the Setup/Travel & Expense/Settings page.