The IRS changed my return last year and I did not get back as much as you say I did. I need to update that number for this year's return. How do I do this?

A Federal tax refund is not entered on a federal tax return.  So the IRS changing your refund is not relevant to entering your tax data on a 2016 federal tax return.

If you are legally married you do not claim a spouse as a dependent.  You would file your tax return as Married Filing Jointly even if one spouse has little or no income.  You receive the highest standard deduction of $12,600 and you each receive a personal exemption of $4,050.