There are 2 ways to approve/decline any leave request:

1. Web login - leave approval page

2. Email notification

Leave request notification via web login

Path : Leave > Approval

Click on the Arrow under Actions and it will redirect you to the leave detail page.

Here you have an option to Approve or Decline the leave request.

Leave request notification via email

Click on the link given and it will redirect you to the approval page.

For bulk approval, tick the checkbox beside the leave requests, then click Approve Selected.