You can delete your account and all of its data by going to the More tab on the bottom right of the screen and then tap Account. On this screen is an option to delete your account.

Make sure you are absolutely sure you want to do this as there is no restoring the data once this is done.

If you have a question about how something works or anything else that's making you want to delete you account we may be able to answer the question. Please give us a chance to resolve the issue for you. You can contact us from the More tab, then Chat with Support.