How To Join Steam Groups
To join a Steam Group Lobby, select the Steam Groups tab in the Main Menu and join any of the lobbies that are listed by clicking the ‘+’ icon. You can always invite your Steam friends to join your lobby, even if they are not members of the Steam Group. Users cannot request to join these groups. Login to your Steam account. Select GROUPS and click the Visit admin page link next to the group you wish to edit. Select the Edit group permissions tab and click the circle next to the desired Group Type to change it.
Search Steam Groups By Tag
Fill out the 'Create a Group' form, entering such information as your group name and group URL, and click 'Create' when finished.Click 'Create' to create your Steam group and navigate to the group by click 'Groups' from your user name drop-down menu.Click 'Group Chat' to the right of your created group in the Groups list to open the chat room.Click the arrow to the right of your friend's name in your Friends list, hover your mouse over 'Invite to Chat Room' and click the name of your group to invite that friend to the room.