Simple Security Question

I’m a first-time user with Mattermost, and am trying to install it. I am following the instructions on I have successfully installed it and am able to invite other team members to join the team. However, my main issue now is that in the address bar above, instead of saying “Secure” in green, it says “Not Secure” in red with a slash through the https part. I’m just not sure how to fix this. I’m sure it’s a simple fix, I’m just really new to this.

To use https, you need to configure TLS. See for how to do that.