How do I enter a k-1 received for an single member LLC? Since I file as a schedule C/

Did you prepare a separate return for the business?  Where did the K-1 come from?

A single member LLC is considered a sole-proprietorship and the income and expenses are reported on a Schedule C.

I'm not sure where a K-1 fits in the picture since they are issued by pass-through entities like partnerships, S-Corporations and Trusts/Estates..