A Zoom Meeting can only ever have 1 Host. Once you start the meeting and others arrive, you can then assign Co-Host roles to selected participants.
First, you must enable the ability for the Host to Add Co-hosts.
Login into your Zoom account in a web browser. Go to SETTINGS, then scroll down the right-side of options until you find a section name "Co-host". The description will read "Allow the host to add -co-hosts. Co-hosts have the same in-meeting controls as the host"