Try these steps first
https://krmqwo.weebly.com/blog/how-to-check-app-performance-on-mac. After trying each step below, try to send a message again.
How To Find The Messages App On My Mac
Ever since iOS 7, Apple has provided a Text Message Forwarding service that can push SMS messages received through your iPhone's cellular network to your other Apple devices. Address your message by typing the recipient's name, email address, or phone number. Or click and choose a recipient. If they're in your Contacts app, Messages finds them as you type. To start a group conversation, just add more recipients. Type your message in the field at the bottom of the window, then press Return to send it.
- Restart your Mac. Choose Apple menu > Restart, then click Restart.
- Make sure that your software is up to date. Learn how to update the software on your Mac.
- Make sure that your Mac is connected to the Internet. To check your Internet connection, try loading a page in Safari or another web browser.
- Check that the date and time is set correctly on your Mac.
- Make sure that you enter the correct phone number or email address for the contact.
![How to get the messages app on my mac computer How to get the messages app on my mac computer](/uploads/1/3/4/2/134253130/350697519.jpg)
If you see ‘This user is not registered with iMessage’
If you try to send a message and see an alert that the person isn’t registered with iMessage, the message is trying to send using SMS/MMS. Paintbrush app download. Make sure Text Message Forwarding is set up and your iPhone is powered on. How to stop an app when mac start.
How To Use Message App
If your contacts see your email instead of your phone number
If you can send messages but your contacts see your email address instead of your phone number, make sure that you're signed in to iMessage with the same Apple ID on all your devices. Learn how to add your phone number to Messages on your Mac.
Learn more
How To Reinstall Messages On Mac
- If you still can't send or receive messages, contact Apple Support.
- Check the Apple System Status page for a temporary outage affecting iMessage or FaceTime.
- Use Messages with your Mac.