In case you have already efiled your ITR in other ways and want to delete your data. Following are the steps to deactivate Tax Payer on Quicko:
1. Login to Quicko,
2. Go to Taxpayers Dashboard,
3. Click on View Profile,
4. Go to Personal Information,
5. Click on Deactivate Tax Payer,
6. Type CONFIRM and Submit.
Note: Once you submit, you will loose data of your efiled ITR as well on Quicko. You can only access it through your account on Income Tax efiling site.