You can de-activate your account at any point of time. Follow the steps as below:
Login to QuackQuack.in
Go to Settings (Login to your QuackQuack.in account and click on the down arrow key from top-right of the screen)
Click on Deactivate Account on the left of the screen and follow instructions
Note: After deactivating your account, your account will be suspended and your profile will not be visible to anyone. However, if you try to login again, your account will go active.