Hi @Kathryn489
Links below on how to add co-hosts. You'll need to decide which of the 3 levels of access/permissions you would like your co-host to have.
One caution...If the co-host doesn't have quick replies under their logon, they can respond to messages, but won't have the ability to use/access quick replies. I wouldn't setup scheduled messages under the co-host (I'm not sure if they would get sent twice or not 🤔). However, I would be sure that the co-host has important quick replies set up so they can easily use them on their login. Other hosts might be able to advise also?
Adding Co-hosts to Your Listing
https://www.airbnb.com/help/article/1244
What Can Co-Hosts Do?
https://www.airbnb.com/help/article/1534