Games files should be located inside of the TCAdmin\Games directory. By default, this is C:\TCAFiles\Games on Windows or /home/tcadmin/tcafiles/games on Linux.
TCAdmin is a game server control panel. TCAdmin is being used to make administration of your game servers easier.
To join the server, you need to start your game client (the Minecraft Bedrock Edition client) with the same version of Minecraft that the server is running. Once your client is started, you can join the server using the IP and port (the part you crossed out with black on your screenshot).
In an ideal scenario, you'd be using a billing system like WHMCS, Blesta, WiseCP or similar. Customers order a game service through your website, and your website tells TCAdmin which service it needs to setup.
You can see information about the TCAdmin module for WHMCS here: https://help.tcadmin.com/TCAdmin2_advanced_module_for_WHMCS