just change the expiry date from the main sheet, ROW -6
then in the ROW-4 there is the field for symbol code, default if NIFTY, no need to change that if you want to trade NIFTY only, if you want other stocks just modify that to the corresponding NSE FO STK symbol, for example SBIN
then clcik on refresh button and wait, then it will update and bingo!!
similarly for pivots, just push update pivots button in the sheet.again bingo!!
hope this helps.