We have lived overseas for the entire 2018. where do I add that

If you are a U.S. citizen or a resident alien of the United States and you live abroad, you are taxed on your worldwide income. However, you may qualify to exclude up to $104,100 in 2018 from income.  In addition, you can exclude or deduct certain foreign housing amounts.  For additional information see Foreign Earned Income Exclusion and Publication 54 - Tax Guide for US Citizens Abroad

If you qualify, you can use Form 2555 to figure your foreign earned income exclusion and your housing exclusion or deduction. You cannot exclude or deduct more than your foreign earned income for the year.

In TurboTax Online (while in your return) click on "Search" and type "Foreign Earned Income" in the Search window and hit enter.

• Click on "Jump to Foreign Earned Income"
• Answer "Yes" to "Did you make any money outside the U.S.?"
• Continue through the interview to complete Form 2555 to report your foreign earned income and take the exclusion