If you have more than one Airbnb account, go to Settings > Channel Manager > Airbnb > Accounts then click on "Connect with Airbnb" to connect another account.

To connect another Airbnb account you need to completely log out of the Airbnb account you have already connected.

Note: Airbnb caches your login data. To prevent being redirected to a wrong Airbnb account log out of Airbnb. Close all browser windows and clear your cache. You should then have the option to switch or another Airbnb account or see this screen from where you can log in fresh: