Here are the steps you need to follow to delete your account:
Step 1. First, you need to delete all your boards.
In case you don’t know how to delete a board, check out this article: How to delete a board?
Step 2. After deleting all your boards, go to “Your Account” page.
Step 3. At the bottom of this page, you’re going to see the “Delete account” button.
Note: Once you delete your account, you won't be able to access it again. After 30 days, all your data will be deleted.
Final Step. After clicking on “Delete account” button you’re going to see a message saying: “Are you sure you want to delete your account?”.
Now enter your password and click on the “Delete” button to conclude.