Your company's Corppass administrator just needs to assign your new Chief Executive Officer/ Managing Director/ Executive Director/ President the OurSG Grants portal Acceptor role, so that they can accept the Letter Of Award.
If you have yet to submit your application, update your Letter Of Award addressee.
If you have submitted your application and it hasn't been approved, contact the grant processing agency. They will return your application, so you can update it.
If you have already received a Letter Of Award, your new Chief Executive Officer/ Managing Director/ Executive Director/ President will be able to accept it when your Corppass administrator assigns them the Acceptor role. Just update the grant processing agency and ACRA of the change in management.