Use reminders from your Internet accounts
If you keep your reminders in Internet accounts—for example, iCloud, Exchange, Yahoo, or AOL—you can use the accounts in Reminders on your Mac, and access all your reminders in one place.
Add an account
Choose Reminders > Add Account, select the account type, then follow the onscreen instructions. For information about adding an iCloud account, see Set up iCloud on your Mac. For information about adding other accounts, see Add an account.
Set up your iOS devices to use the same account, so that your reminders stay up to date across all your devices. For more information, see the “Get started” section of the user guide for iPhone, iPad, or iPod touch. For a device that doesn’t use the latest iOS version, get the user guide from the Apple Support manuals website.
Each account you add is listed separately in the sidebar. If the sidebar isn’t showing, choose View > Show Sidebar.
Stop using an account for Reminders
You can temporarily stop using an account so that its reminder lists and reminders no longer appear in Reminders on your Mac.
Choose Reminders > Accounts, select the account you want to stop using, then deselect the Reminders checkbox.
To use the account again with Reminders, select the Reminders checkbox. The account’s reminder lists and reminders reappear.
Remove an account
If you no longer want to use an account in any app, including Reminders, you can remove the account.
Note: If you use iCloud Keychain, and you remove an account (other than your primary iCloud account), you’re asked whether to remove the account from your other Mac computers that use iCloud Keychain, or just turn off all the account features on this Mac.
Choose Reminders > Accounts, select the account you want to remove, then click the Remove button
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You can view, add, and modify reminders in the Reminders app on all your devices that use the same accounts. You can also view, add, and modify your iCloud reminders on iCloud.com. Changes you make show up everywhere, so you always have your most current reminders at hand. Reminder notifications also appear on your Mac and other devices that use the same accounts.
If you use Handoff, you can switch between your Mac and other devices while viewing reminders. To open a reminder list handed off to your Mac, click the Handoff Reminders icon that appears at the left side of the Dock.