Scroll down to see how to do this in Symphony 1.5
In Symphony 2.0:
Click + in the top left of the screen and type the names of the contacts you wish to include (figure 1):
Figure 1 Add members
From here, you can start a 1:1 or group chat, or add a name to create a chat room. Note, in Symphony 2.0, you can turn a group chat into a chat room at a later time.
As you type a chat room name, additional fields and settings will be displayed to help you create your chat as quickly as possible (figure 2):
Figure 2 Add a name to reveal room settings
Choose your settings and click Create Chat Room to open your new chat room.
In Symphony 1.5:
Click + in the top left of the screen, select Chat Room (Figure 1):
Figure 1 Chat Room option from + menu
Enter your chat room name and review the settings, then click Next to add members. (Figure 2):
Figure 2 Create your chat room name and review settings