How to enable internal chat feature

Is there an internal chat feature without using the integration with (Slack/Mattermost), as in the image there is a chat feature but as appears (You don’t have any active chat names.) so how can I activate this feature and use the internal chat with team member without any integration.

Appreciating your great help.

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Gitlab comes with Mattermost. Instructions on how to set it up is in the following page.
https://docs.gitlab.com/omnibus/gitlab-mattermost/

Thank you @hozawa for your help.
I have configured Mattermost on my environment as in the image. But that is not what I want.

I want an internal screen for chat like Facebook, and no need to use other link like Mattermost. So is this feature available or not?

Appreciating your great help.

With the current version, I think that’s it.