Captive Portal Guest Account

I have setup a Captive Portal with Guest Account, but user are not able to view their remaining wi-fi quota which they need the operator to check for them.

It will be good if all the user can view their own remaining wi-fi quota while they login to their account on the splash page and also have a feature to logout so the user will feel more safe that their data is not consuming other way when they only disconnect the connection.