Sign in
Every nursery has its own address. You sign in there, not here.
Find the invitation email from the nursery. The link in it takes you to your own address.
The address looks like name.onlinebolcsi.hu, where “name” is the nursery’s short name.
Sign in there with your email and password. Forgot your password? You can ask for a new one on the same page.
No invitation? Ask the nursery. You cannot open an account yourself, because the nursery decides who may see the children’s data.