Massachusetts Form 1 Line 11b - need to edit

I am primary earner with my husband as spouse. I have retirement plan, my husband does not. My husband thought when he entered that his spouse had retirement he was referring to me, not recognizing I had already entered it for me.  Now it looks like he had $2000 retirement plan credit when he does not.  It shows up on our Massachusetts taxes, Form 1, Line 11b.  I have gone through and looked all over and it this question does not pop up again.  Where do I find it? How do I edit it?