Sagar,
If it is GCI MT4, then click on the button 'Market Watch' 3rd from the left on top....
If Market watch is already open take the cursor on it Left click Mouse button and select 'Symbols'
The window that opens expand the rows and if NSE is in Grey then double click on it.... and small symbol on the left of it should turn Yellow... it means you have activated that particular symbol.... and you can add the chart from the + sign on top...
SG