How to require login for viewing bandwidthd webpage

I have installed bandwidthd to monitor data usage by IP address. The IP address of my router is 192.168.1.1, so I am able to see bandwidthd's webpage at http://192.168.1.1/bandwidthd/. Unfortunately, http://192.168.1.1/bandwidthd/ does not require any password credentials to access; it is accessible by anyone on the network. How do I make it require a login username and password like that required for accessing OpenWrt's admin (LuCI)?