A late arrival is an informational record, not leave. From the dashboard, choose Log late arrival, enter the date, how late you were and the reason. Your manager receives an in-app notification. They can opt into email alerts from Account. The entry appears on your employee record and does not reduce any allowance.
Use a leave request when the time away should count against an allowance. Use a late-arrival entry when the team only needs a record of when you arrived and why.