If a team is already created, but there are fewer members in the team and you want to add more members then you have to click on the setting icon of the existing team and in that go to the Allocate member. There you can add more members. All the users attached to the Callhippo account will be shown in the list of Allocate Members and clicking on the user name will allocate him to the team. If you want to deallocate the member from the team then click on the user name of that member.