You need to use Online Premium or any of the Desktop programs to enter a K-1.
To enter a K-1 go to
Federal Taxes Tab or Personal (Home & Business version)
Wages and Income
Then scroll way down to S-Corp, Partnerships and Trusts
Schedules K-1 - Click the Start or Update button
Be sure to pick the right kind of K-1. There are 3 kinds, 1041, 1065 & 1120S