Set up CalDAV on your iPhone or iPad When you add your CalDAV account, you can sync your Calendars with your iOS device. Add your CalDAV account Tap Settings > Calendar > Add Account > Other .  If you're adding another account, tap Accounts > Add Account. Tap Add CalDAV Account. Enter CalDAV information Enter information as below, then tap Next. Server my.mailhappen.com User Name your email address Password your email address Sync your content You can sync Calendars and Reminders. When you're finished, tap Save. Done The CalDAV account is added. You can use Calendar App to see all your events.