You will get the above image of a blank dialog box.
You will get a dialog saying 'Do you remember your LastPass master password? This impacts the procedure for deleting your account.' - Click 'Yes'. However if you log in to your LastPass account and then go to, you can click the 'Delete' button. You cannot cancel your auto-renewal or remove your payment details either nor can the CSRs delete your account (according to them) if you somehow get through to them on the phone. I've been trying to delete my LastPass account for the last 3 days, but the site is 'not working' (҂⌣̀_⌣́)