In the HSA interview, there will be a screen that asks you if were enrolled in an HDHP n 2017 (see screenshot below).
On this screen, answer "yes". Three more lines will appear (see screenshot); check the option that read "I had different plan types at different time of the year". It doesn't say it, but this includes situations in which you had no coverage for part of the year.
On the next screen, you will have the opportunity to include which months you had coverage and what kind you had.
