If you cannot enter the directory, or you configured your RPC interface to listen on another socket, you can use the -addr flag to specify the address of the RPC interface (unix:///path/to/socket, http://127.0.0.1:8080, etc.).

Once the CLI is open, you can type help to see a list of commands.

Some useful commands to set up a new server:

createroom Create a new room
createaccount Create an account for a room

The usage for each command is documented in the CLI.