Steps
Ask your admin to go to the Chain level in Event Temple.
They should navigate to Settings → Users.
The admin selects your user profile.
Under Roles and Organizations, they can add another property (organization) to your user account.
Once added, you will have access to the additional organization.
Notes
Only chain administrators can assign users to multiple organizations.
Each organization remains separate, with its own data and permissions.
Your access in each organization depends on the role the admin assigns.