Form 8889

I filled out my prior year tax return and put my HSA deductions that were made by my employer on behalf of me with the source coming from payroll deductions. I put this on line 9 of Form 8889, Employer HSA Contributions.  I think i should have put this on line 2, HSA Contributions.  Am I correct?  How do i go about correcting this on my prior year tax return?