if you do nothing the IRS will include this in income, don't know your 2017 tax situation so don't know what effect this would have. I would say you're better off amending.
here's a link to form 982 instructions. if you don't understand them you can post your questions back in this thread. it may be difficult to give a proper answer because we don't have any info. you might be better off seeing a pro.
https://www.irs.gov/pub/irs-pdf/i982.pdf
