As a member of an LLC you should be tracking your basis in this investment. See the attached IRS link to help you determine this if you have not already done so:
https://www.irs.gov/publications/p541/ar02.html#en_US_201601_publink1000104289
Once you have determined your basis, including updating this for the final K-1 figures, you will have what you need.
Your "selling price" will be your liquidating distribution. Make sure you don't double count this; include it in your basis calculation and then also as selling price.
If after adjusting your basis for the liquidating distribution you still have basis remaining, then you have a capital loss for this amount. This will be reported on Schedule D and the applicable form 8949.
If after adjusting your basis for the liquidating distribution your basis goes negative, then you have a capital gain for this negative amount which essentially puts your basis back to zero. Once again this will be reported on Schedule D and the applicable form 8949.
The two figures you need to add to the input sheet you attached are the liquidating distribution (selling price) and your basis, which you need to calculate.
*A reminder that posts in a forum such as this do not constitute tax advice.
Also keep in mind the date of replies, as tax law changes.
