Anyone with a Panka account can do it, and whoever creates the team becomes its administrator. If you’re not in any team yet, after signing in tap “Create a team”; if you already have one, go to Settings → “Create a new team”.
In the form, give the team a name, choose whether you’ll use it for “Games with friends” or as “Team & league”, pick the format and check the name of the first season, then tap “Create team”. You can be administrator of at most 3 teams.