First things first, access your Telegram App and open a new chat. Search for “BotFather” it should show a message like the following:
Select “Start” and type in the chat “/newbot”. It will ask for you to select the name for your bot and a username.
As soon as you set your bot name and username the following message will appear:
Copy the token provided above and feel free to return to Rocket.Chat to finish the setup.
You can also follow the link to find Telegram’s instructions on this.