Belonging to more than one organization
One sign-in can belong to several organizations: perhaps you help at two schools, or run both the PTA's fun run and a sports team's. You can be an Admin in one and an Editor in another.
Switching between them
When you sign in, My Organizations lists each organization you belong to, with your role. Choose one to open its dashboard. To switch later, choose your email address at the top right, then My Organizations.
If you belong to only one organization, you go straight to its dashboard.
Joining another organization
Ask one of its Admins to invite your email address. See Inviting staff and volunteers.
Starting another organization
While signed in, go to Start a Fundraiser. You'll skip straight to setting up the new organization, and become its Admin.