To send an SMS message with Kotlin and the Twilio API, you need to add the Twilio helper library to your project's Gradle or Maven file, initialise the Twilio REST Client with your Account SID and Auth Token, and then use the Message.creator method to create and send a message. This can be done in just 30 seconds by following the steps provided, which include specifying the phone number you are sending from, the Twilio number you are sending from, and the body of the message. Once complete, you can run the code and wait for the magic to happen, after which you will have successfully sent an SMS message using Kotlin and the Twilio API.