I filed taxes for 2016. I paid 8,800.00. There was an error where I didn't file about 8,000 in expenses. The amended return now says I am owed a refund. What happens next

I filed a 2016 return and had to pay 8,800. So I paid it last year. But then I found out that I could claim flight and hotel expenses. Silly that I didn't know but it is what it is. Anyway, I filled out an amended 2016 return but I didn't send it in yet. The return shows I am owed 1,100.00. I didn't see anywhere to put in that I paid 8,800 taxes in 2016. Do they figure that out or do I put it somewhere? My State return didn't change. Any advice?