I need to transfer a repository from a user account to an organization the user is a member of. Per GitHUb's docs, I need to make the user account an admin of the organization first.
GitHub's docs describe the different levels of access to an organization, but I can't find out how to actually change a user's level of access to an organisation.
How can I make the organization member an admin?
Note that since June 2017, you can apply an Admin access right to a sub-team (instead of one giant unique team as before)
See "Nested teams add depth to your team structure":
So that is another way to assign a user admin right: make him/her part of a sub-sub team called "admins" within an organization.
Official GitHub Documentation: Nested Teams.
Access levels in GitHub are configured per Team inside the Organization.