In the Reminders app, you can use multiple accounts—such as iCloud, enterprise-managed iCloud, Microsoft Exchange, and Yahoo—and keep all your to-do lists in one place. Your reminders stay up to date on all your devices that use the same accounts.
Note: All Reminders features described in this guide are available when you use updated reminders in iCloud. Some features aren’t available when using other accounts.
Go to Settings on your iPad.
On the Welcome to Reminders screen, choose one of the following options:
Update Now: Begin the update process.
Update Later: A blue Update button appears above your lists; tap it when you’re ready to update your reminders.
Note: Updated reminders aren’t backward compatible with the Reminders app in earlier versions of iOS and macOS. See the Apple Support article Use iCloud on iPadSet up mail, contacts, and calendar accounts on iPad