Chat room owners can pin a message to the chat header to ensure it is seen by all members. This might be useful for particularly important messages or documents chat room members may want easy access to.
Hover over the message you want to pin, click the three dot menu and select Pin message (Figure 1):
Figure 1 Pin message
The message will be pinned to the chat header in a blue box making it prominent to all chat room members (Figure 2):
Figure 2 Pinned Message
Note: Pinned messages can be replaced with new ones by other chat room owners using the steps above.