It's good to communicate to your fellow buddies when working together. And yes, google chat is the most outdated way to communicate and that's why we're using it.
If you've logged in to your account that you have signed up to the club with, you should easily be able to enter each chat in.
Please don't spam in the group chat, but you can send in fun things every once in a while. But not always. Just remember, this is kinda serious but you should enjoy it, so you should take care of your responsibilities.
You can chat with people in your group, but if you need to reach out to a specific person on your team, you can go to your teams' individual space.