Post Logging in to your Giottus account you can view your Open Orders either in Dashboard or Spot Exchange 

In Spot Exchange page you can view your open orders below the Orderbook My Open Orders and in Dashboard you can view Open Orders below INR deposit/withdraw details.

Open Orders in Dashboard,

Open Orders in Spot Exchange,

To Cancel your open orders, you can go to the Open order section as detailed above and Cancel your orders.

Kindly note, only orders that have not been executed yet can be cancelled.