File return online (which currently shows for filing only ITR 1) : means that you need to be connected to internet for filling the form as well as submitting it. Choose whether you want to use digital signature while filing. A digital signature authenticates electronic documents in a similar manner a handwritten signature authenticates printed documents. This signature cannot be forged.Choose the Form and Assessment Year.Fill the form.Submit the form.On successful submission acknowledgement is generated. If you did not use digital signature the Income Tax receipt, ITR-V, needs to be printed out and sent to Central Processing Unit (CPC) Bangalore within 120 days of filing return.