I had a period that I was unemployed due to being a caregiver for my grandmother. I marked unemployed in the employer section like it stated but it wants me to fill out all fields. I'm unsure how to answer those questions like the address and other fields marked with astericks.
I would recommend not marking it as "unemployed".
Being unemployed carries a big stigma when it comes to job applications. If you were working as a personal caregiver (especially for a family member) then it is far preferable to put that down instead of "unemployed".