To change the membership of your team, open the team page from the Teams tab of My Kialo and click ‘Members’. The members of a team can be managed in the same way as the members of a discussion: see Inviting Participants to a Discussion, Inviting Participants by Email Link, and Participant Rights and Roles.
Note that for teams, there are three roles: Member, Admin and Owner. This should be distinguished from the roles teams are granted in individual discussions - teams can be given any participant role in a discussion, and the role given in a discussion to a team will accrue to all of its members. Roles within a team simply control what rights members have in regard to the team itself.