1. Tap on the Leave tab
2. Scroll down to the bottom of the page and select Pending Leaves
3. Navigate to the leave you'd like to approve/reject, tap on UPDATE STATUS and tap on Update Status for 1 leave(s) below
4. Lastly, select Approved or Rejected and put notes (if applicable). Tap SUBMIT to proceed.
Related Article: [Android] How to approve/reject a leave application?