Template registration with the DLT Platform is now a mandatory process and this needs to be done by every client intending on executing messages to their clients.
In order to register the Template you will first need to have done the Entity Registration with the operators.. Find out more about it - Here.
You will also need to do the SenderID registration with the operators as well. Read more about this - Here.
The Template registration process is quite simple across operators and you can find the guide for each operator
Once the you have applied for the template, you will hear back from the operators regarding the status within 24-48 hours.