How to set up Messages on the Mac
- Launch Messages from your desktop, dock, or Applications folder.
- Enter your Apple ID email address and password. If you have two-step or two-factor authentication turned on for your Apple ID, enter your verification code.
Click on Messages in the Menu bar and select Preferences.
Select the Accounts tab.
Select the phone number and email addresses at which you would like to be reached.
- Choose which phone number or email address people will see when you start a new conversation.
How to set up Messages in iCloud in macOS High Sierra
- Open Messages.
- Click Messages in the Menu bar.
- Click Preferences.
- Click the Accounts tab.
- Click on your iMessage account.
- Click the check box next to Enable Messages on iCloud.
- Click the Sync Now button to sync immediately.
- And that's how you turn on iMessage sync. Of course, to use it properly, you'll also need to turn it on on an iPhone or iPad running iOS 11.
How to set up Messages in iCloud in iOS 11
You'll need to make sure Messages in iCloud is enabled in iOS 11 so it can sync messages between your iPhone, iPad, and Mac.
- Open Settings.
- Tap the Apple ID banner.
- Tap iCloud.
- Make sure the switch next to Messages is flipped to the green 'On' position.
- Tap Apple ID.
- Tap Settings.
- Tap Messages
- Tap Sync Now to immediately sync your message with iCloud