A team on Spigo means that you play together two and two against other teams in the team games on Spigo (at present Ludo and Yatzy, later One, Whist and Bridge et al.). Later it's also going to be possible to participate in team tournaments where the teams on Spigo compete against each other. You can be a member of several teams at the same time, but only be a member of one team per team game.
Choose "Create team" in the menu to the left to get started.