Full disclosure...this is not my strength, but I'll lead you as far as I can.
First, there is a level of complexity you have to overcome. Reading your original post, you have a headless install of Raspbian. If you want to run the free version of VNC viewer, you cant have a headless pi. If your willing to pay for the Enterprise Version of VNC viewer, you can run headless. This was the dilemma I ran into on my initial build.
https://www.raspberrypi.org/documentation/remote-access/vnc/README.md
I had no success creating a virtual desktop, so I added a desktop and moved away from a headless install.
With all that being said, you don't necessarily need VNC viewer to use remote.it
The first thing you need to do is create a remote.it account. (you can also create an account in the interactive installer, but I set mine up before installing on the pi)
https://docs.remote.it/getting-started
Once you're signed up. go to your pi and SSH in...
Code:
sudo apt update
sudo apt full−upgrade
sudo apt install connectd
sudo connectd_installer
the third command installs remote.it on your pi, the last command opens the installer. (I think you made it this far, but I wasn't going to make any assumptions)
Once installed, you will be in an interactive installer. A walk through of the interactive installer is in the link above. To access your brewpi you'll want to connect to the web based server (http). If you want to connect to your pi GUI, you'll need to activate the VNC Server.
Download the remote.it app onto your devices...and you can now safely and securely, access your pi anywhere that you have an internet connection.