Here's a quick way to send an iMessage from the Contacts app in OS X on your Mac.
1. Go to the Contacts app on your Mac.
2. Find the contact you want to send an iMessage.
3. Click the label for your contact's email or number.
4. Click on Send Message.
5. Type in your iMessage, then click the Send button.
This is a fast way to send an iMessage by using the Contacts app.
Read more: iMore