Assing Alternative Host after Webinar is scheduled

Hello,

Recently we scheduled a webinar and during this process we had the option to set an Alternative Host for the meeting. At the time we did not set it up because we needed to upgrade our colleague's account.

However, now that the account has been upgraded it seems that I cannot find the option to add him anymore. Is it not longer possible since the webinar is already scheduled, or does it move places from the tabs?

Apologies for the newbie question but this is the first webinar we run on Zoom.

Thanks for your help.