You need to have an "Admin" role in order to add/remove users. If you do not see the "Users" section under "Settings" - then you do not have an "Admin" role.
Adding a new user to Foundational
Login to Foundational
Click on your profile picture at the left navigation bar, and then click on "Settings"
Click on "Users" and then on "Invite User"
Fill the details of the new user: Email, Role, Full Name, and then click "Invite"
Roles:
Admin Role - allows users to add/remove new users to Foundational, as well as edit configuration of SSO and authentication.
Read Only Role - allows the user to fully use Foundational, but does not allow them to add/remove users and change SSO and authentication settings.
Removing existing user from Foundational
Login to Foundational
Click on your profile picture at the left navigation bar, and then click on "Settings"
Click on "Users" and then click on the three dots button at the end of the line of the user you want to remove, and click "Delete User"
TBD