In the Actions column, you can find three options you can use: Approve, Reject, Edit.
Approve confirms the appointment, Reject cancels the appointment and Edit allows you to change the arrangement details.
Depending on the action taken — approved or rejected — the appointment status will be changed automatically to Approved or Canceled.
By clicking on the Edit icon you will open a new popup with the arrangement data. Here you can change the major part of meeting details: time and date, service, price, and staff.