If my account notifies me that my employer ID number is supposed to have an “WTH” at the end, but mine only has an “W” at the end, how do I go back and manually change it

I tried going back and i don’t know how to access my W2’s again. I also tried to Clear and Start Over but it said that I’ve already submitted it and can’t start over. BUT it says I can’t submit it without the correct information??