In this screen, you can give administrators rights on any organisation.
This is particularly useful when you just created a new organisation and need to give rights to yourself and other operators to access and work in the organisation context of this new organisation,
Click on NEW, select the existing operator (or create a new one) and assign a specific organisation. No need to modify the password.
Then log out, wait a few seconds, log in again and you will see the new organisation on the organisation context.