The welcome email will be sent to new users email if it was enabled from CityBook Add-Ons options screen
And to change the email, follow How to Send A Custom Welcome Email to New Users in WordPress on wpbiginner.
Change Welcome Email to New Users
twentyseventeen domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /var/www/dotorg/wps/docs/wp-includes/functions.php on line 6121The welcome email will be sent to new users email if it was enabled from CityBook Add-Ons options screen
And to change the email, follow How to Send A Custom Welcome Email to New Users in WordPress on wpbiginner.