Please see this answer from ChelsiE2:
To enter Health Insurance Premiums you paid as a Self Employed S-Corporation Member:
- Sign into your TurboTax Account
- Click Continue if prompted to do so
- Click Search in the upper right hand corner of your screen
- Type "K-1"
- Click Jump to K-1
- Click through until you have the option to Update or Add your K-1
- If you've already entered your K-1, click Edit, if you haven't then click Add
- Enter all the applicable information or click through until you come to the Other Situations screen
- Check the box next to, "I personally paid health insurance...."
- Click Continue until you get to the Self Employed Health Insurance screen
