Based on your reference to "K-1" I am assuming that this is a multi-member LLC that has already filed it's own completely separate Form 1065 tax return and has issued K-1's to each owner. If so, you are asked for K-1 information under the Wages & Income tab under the Business Investment & Estate/Trust heading.
If this is a single-member LLC, then you should not be in possession of a K-1 from that business.
A single member LLC is considered a disregarded entity for tax purposes and is reported on a Sch C.
A multi-member LLC has to file a separate return and then a 1120-S or 1120 is filed.