Once logged into WebEx click the chat icon

Click the + (plus) icon

Click Send a Message

The To: search option should appear

Start typing the name of the person  Ex. Chad

    They choose the exact person you want to sent a Chat to

At bottom of window, Type Message 

Once message is complete click the flying arrow icon on the bottom right

There are also options to:

    Share a file

    Send a GIF

    Make a call