Make an application for a child board of the Zocalo for your NGO here.
By doing so you will become Moderator of that child board until the organization makes known that it wants to change leadership.
You then become responsible for keeping record of members of your organization.
Once there are 5 NGOs in the Zocalo, in order to get a child board for a new NGO you will have to have a petition by a number of members greater than the number of members in the smallest NGO currently in the Zocalo. Your organization will then displace theirs.