First of all you need to click on the profile tab which is shown at right-bottom corner
Step 2
Then you will see the settings icon at the top-right corner, click on the icon to move further
Step 3
Now you are in the settings screen, press the first dropdown which is having the title 'My Account', then you can see the option 'Delete My Account', just press the option
Step 4
Now you have to select a reason in order to delete your account, after selecting an option you need to press the 'Delete Account' button which is at the bottom of the screen
Step 5
You will get a confirmation popup, in this popup just you need to click 'Yes, Delete' button