If you have not paid, simply exit and do not complete filing. You can also clear all entries in this year's return by going to My Account then Clear & start over. https://ttlc.intuit.com/replies/4248526
If you need a refund you will need to contact support:
For the easiest way of contacting someone,
·
Sign in select Help at the top
right of your screen, then click Contact (it will be
towards the bottom) and we’ll help you connect with an expert From there
you can also request a callback so you are not waiting on hold.
·
Or you can call directly, 1(800) 446-8848. I am including
the information on specific phone numbers just in case you need them: https://ttlc.intuit.com/replies/3300041