Groups bring players together: a team, a building crew, a fan club or just your friends.
Press Groups at the top of the website, then Create a group. Give it a name, a description and, if you want, an emblem picture.
On a place's Edit Game page, set Owner to a group you own or are an officer of. The game shows up on the group's page, and its game page names the group as the creator. You keep editing it. See Building.