First of all you need to click on the profile tab which is shown at right-bottom corner
Then you will see the settings icon at top-right corner , click on the icon to move further
Now you are in settings screen , press the first dropdown which is having title 'My Account' , then you can see the option 'Delete My Account' , just press the option
Now you have to select a reason in order to delete your account , after selecting a option you need to press the 'Delete Account' button which is in the bottom of screen
You will get a confirmation popup , in this popup just you need to click 'Yes, Delete' button
Your accout will be deleted successfully!