Yes, as a Meeting Initiator/Organizer you can Reschedule an Un-started/Pending Meeting. Once Meeting is commenced or concluded it cannot be modified.
a) Login to ApnaComplex. Go to your complex/layout’s home page.
b) Meeting → Meeting Calendar → Please select the meeting created.
c) Click on ‘ Reschedule Meeting ‘.
d) Enter date at ‘Reschedule to’, ‘Reschedule Start time’ and ‘Reschedule End time’.
e) Click on ‘Update Changes’.