We recommend using the official Rocket.Chat mobile apps, which are available for iOS and Android here:

How to Setup the App

After downloading the mobile app, you have to enter the following link to connect to our chatroom:

chat.worldclassgolf.com

Afterwards, follow the instructions in the app to log in with your WorldClassGolf.com account.
See the following video for a short demonstration on how to connect to the community chat with the Rocket.Chat mobile app:

For the first login we recommend using a desktop browser, as you have to choose a username for the chatroom. Go to the Chatroom here