Regarding Multiple Currencies Issue

Yesterday I setup my account and installed in my hosting server, In my payment section I entered USD, INR, Pounds, my country currency INR. After entering my payments that already paid expense I selected some USD and some pounds but in dashboard is is showing only INR? I checked my vendors section and set it up in that everything is ok. but when it showing dashboard and reports it is only showing Indian Rupees, it is not showing USD & Pounds? Why I could not understand ? Anybody can reply on this.