
One of the main focal points of the Apple Watch is communication, and as such, it offers a Messages app much like the one on the iPhone. It's not quite as robust as the Messages apps available on other iOS and Mac devices, but Messages on Apple Watch lets you send pre-made replies, animated and non-animated emoji, and full voice-to-text messages.
For those of you who want to learn the ins and outs of creating and responding to messages on the Apple Watch, we've written up a detailed tutorial on the Messages app. Plus we've also got some tips on customizing the available options for communicating with others.
Sending a Message

Open the Messages app.
Firmly press on the Messages list until the icon for New Message appears.
Tap "New Message."
Tap "Add Contact" to select the recipient.
Tap the icon to add a contact. (It looks like the silhouette of a person with a plus (+) symbol next to it.)
Select a contact. Then, select the phone number or Apple ID you wish to use for that person.
Tap "Create Message."
Use the Default Replies, Emoji, or Dictate Text to send the message.
Sending a message can also be done quickly by tapping the button underneath the Digital Crown to bring up your friends list, where you can select a favorite contact. From there just tap the Message icon to get to the messaging options. If you've already got a list of conversations available in the Messages app (which you likely do if you use Messages on the iPhone), you can also just click there to continue a conversation from your wrist.
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Article Link: How to Send and Respond to Messages on Apple Watch