A friend of mine is using Credit Karma to do her taxes. I chose to stick with Turbo Tax, BUT I did wonder why can she unsubmits hers before 2/12, if needed and I cant?

When I say I....I meant "we" as in all Turbo Tax users. I did mine correct for the last few years, but I was curious as to how Credit Karma can go back and change, but Turbo Tax can't. I thought they were in some way affliated