How do I state in turbo tax that health insurance coverage did not lapse, as our 1095-C will prove?

In the Health Insurance section, indicate that you 'had health insurance all year' (screenshot).

Say NO to '..any of these types of plans?' (screenshot). 

You don't have to enter any info from your 1095-C.

Continue until you see 'Done with Health'. 

More info:

https://ttlc.intuit.com/replies/4829606