Hotspot does not default in RB750GL

Hi,
I have a routerboard RB750GL and configured Hotspot on it. When you are connected to the router gives you IP address cos it is also my DHCP router, but when you try to open a browser it just leaves you like that and doesnt do anything. But if i type the default IP address of the Hotspot interface on the router the Login screen will now show.
Please can anyone tell me how to setup this so that the login screen shows once interneet access is required by a user.
Thanks