The new Blurtit deleted any accounts from the old site. It is your choice if you want to reopen it. If you do not, leave it alone. You will not have access to your old account, but any old contributions will still remain.
However, if you'd like to remove any association with your old questions and answers, simply submit a request via www.blurtit.uservoice.com and we'll be happy to help you remove your name and profile picture from all the contributions you've ever made.