They will check your ticket(s) automatically and credit any winnings to your account. You will get an e-mail to say there is a message for you in your account page.
They are checked automatically and if you have any winnings you are informed by e-mail and the money put directly into your account. Can be a bit disappointing tho' if you get a mail to say you are a winner and find it's only a tender. Still all adds up.