Amend tax return due specifying incorrect name on W-2

Hi,

 

I just discovered that I specified my wife's name on one of my W-2s when filling 2020 tax return by mistake.

I tried correcting it to my name today using TurboTax 2020 just to see what is going to happen and I see that we were supposed to get a better refund if I would have done it correctly.

Now the questions are:

1. How do I correct that?

2. Does IRS charge a penalty for my mistake? If it does, then how much.

3. Do I get an extra refund that I am entitled to or it is lost?

 

Thanks!