When an employee you manager requests leave you will receive an email with a summary of the request and a link to the request which you can use to go straight to the approval page for that request.
Alternatively the leave requests will be available on your Dashboard under 'Absence Requests To be Approved'. Click on the Absence Ref to go to the approval page for that leave request. Here you will see the request on the right, underneath which is a breakdown of the hours and days counted against entitlement, under which is the rules tested for this request. On the left is the approval boxes. The Approval(s) box shows a list of the approvals waiting. Clicking on the 'Awaiting Approval' link will populate the Approval Decision box above with that approval. In most cases this will already be done. Under Approval Decision change the Decision from Awaiting Approval to either Approve, Put On Hold or Reject and click submit.
This will send an email to the requester informing them of the decision.