Snapchat can only be accessed via the app, so make sure you download and install the app first to access the steps below. 

On the top left corner of the screen, click on your profile icon

On the next screen, click on the settings icon

Re-enter your username and password, then click Log In

Re-enter your password one more time and click Continue to complete the process. NOTE: You have 30 days to reactivate your account before it's permanently deleted. To do so, log back into your account as normal.

How to Delete Your Snapchat Account