How do I change my marital status and delete my ex?

Did you get divorced?   If you used Turbo Tax last year you should start a brand new account for yourself and not transfer from last year.  You can not remove a spouse or switch the order of names.

TurboTax will not allow you to remove the primary taxpayer on the return. And you should not try to change the order of names.  If you were listed as the spouse and want to be the primary taxpayer now or delete the primary person, you will need to start a new return by logging out and starting over with a new account and new user name and password.  You will not be able to transfer from the prior year.