Deductions & credits

I'm also dealing with this, except my problem is that the entire contribution isn't in the w2...only the part that was a payroll deduction. In addition, there is an annual employer contribution that does not go through the payroll. It just goes through HSA. I should know because I am assigned to do that contribution into everyone's HSA account. So the amount on the 8889 isn't correct. This is just an example, not my numbers. Let's just say that everyone receives $2000 in a single contribution from the employer (but not via payroll). And then say that I contributed $100 a month via payroll contribution...for another $1200. My W2 says I contributed only $1200 when the entire amount would be $3200 contributed that should appear on form 8889. I have always done my taxes manually in the past and would have just put $3200 on form 8889 as my yearly contribution. I ignored that entry on the W2. And $3200 is the correct amount, and yet the W2 is correctly reporting what went through payroll, $1200. So how do I make this work in Turbotax (this is my first time). Can I access form 8889 and just change the contribution amount there? Can I edit the W2 and change the amount there from $1200 to $3200, or is that going to cause me problems somewhere?