Freelance procedure-nursery related

To a licensed nursery school
If you use
My child is now 4 years old. She go to the licensed nursery school.
As my work style changed from part-time to freelance, I had to notify the city hall.
First, I contacted a person in charge by phone. He was told that I need to fill out and submit a " self-employed certificate ".
At the time of part-time work, it was a "work certificate", so it seems to be in a different format.

How to get a self-employed certificate?
You can get a self-employed certificate if you go to the city hall, but I got it from a kosodate-concierge at the " Genkikko Center "!
The kosodate-concierge is at the Chitosekko Center and the Genkikko Center.
They can help you with child-rearing and give you information about nursery schools and kindergartens.