Editing from the Zoom Calendar (LTI Integration) is not supported at this time. The primary host should log in to the Zoom App to edit the meeting directly there.
Alternate hosts can control meeting functions in the meeting but have few default permissions when it comes to editing a scheduled meeting. The primary host for a meeting can go to https://mit.zoom.us/profile/setting, scroll down to "Schedule Privilege", and assign scheduling privilege to an alternate host. Then the alternate host will be able to edit/schedule the primary host's meetings.