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If you are asking about Schedule 2, you don't really "complete" it, it is generated by the program. 

If you had a Schedule C, the Schedule SE is generated (if you had a profit - to pay your Self-Employment Tax) and Schedule 2 would also be generated as a vehicle to post the numbers onto the 1040. 

When the 1040 was shortened, schedules were added to make up for the lost space. 

If you look at your returns, I'm sure you'll find Schedule 2 was included. 

The totals on the schedule 2 is transferred to your 1040.