The module will pause until you click the "Resume script execution" button, the blue arrow on the top-left of this image:
From here, you can set breakpoints, examine variables, step into functions, and any other typical debugging activity.
You can use
Debug Host Address,
Suspend is set to "No", then the log message with the URL will still be written to the log, but the module will not pause and wait for the debug client to connect. The debug client can connect any time after the log message appears.
Path is set, then the server will create a new random UUID every time the server restarts. You can override this and set the path what you want it to be. E.g. if you set the path to
mysecretpath then the URL you need to connect to will look like:
Path that you choose a name that is difficult to guess.