To add users to your school group in Flint, you can either whitelist their email domain or add them individually. To add admins, you can add them individually.
Whitelisting in Flint
If whitelisting is enabled for a school group, any user with that email domain can sign up and use Flint. They can sign up using Google SSO, Microsoft SSO, or regular email sign up, and all they need is the link. To whitelist a domain in Flint, follow these steps:
Click on "Share group" in the school group
This can be found on the left-hand side when in the school group.
Add domain(s) under "Email domains"
Then click "Update" to confirm the changes.
Adding individual users or admins in Flint
In the same share modal for whitelisting email domains, you can invite individual members on the right hand side. You can simply type in the email address(es) you wish to invite, click "Invite", then click "Update" to confirm the invitation.
Now, select whether you would like for the user to be a "member" or an "owner". Owners will have admin access for the school.