First, open the Create Policy window via Products>Policy>Create Policy.
Under the Approval tab, select Yes for Approval Process:
Next, you will need to add 'Approvers' from the Add to Approval Role drop-down, then select an Approval Rule, and set a Due Date:
If the Approval Rule is set to either 'Named Approver' or 'Named Approver + Simple Majority', an approver must be added via the Named Approver drop-down: