Hi and welcome.
Ok, to have any chance of getting some help you have got to give us more detail…
Most importantly which version of Rocket.Chat? You should be testing against 3.15.1
Next, you will need to give us a lot more detail on what you have done so far.
What docs have you read? How have you enabled this?
Have you read this guide on ‘How to ask for help’ ? Some good information on how to write good questions.