Deductions & credits

Looks like I blew it in 2018 taxes and entered my company's contribution into the "you personally made" box.  This resulted in a tax.

Q1: how do I fix that?

Also this seems to be carried over into 2019 taxes, and is trying to charge me again for an excess contribution. 

Q2: How do I fix that?

Never tried filing a corrected TurboTax return.