The individual and community chats can be found by clicking on Chat in the left side menu.
Chats with other individuals can be started on the Contacts screen as shown below. Locate the indvidual to chat with and click on the ‘More’ three dot button beside their name, select ‘Start a chat’.
Clicking on Start a Chat on a contact will initiate a chat session. Likewise Start a Meeting will create an adhoc video meeting with that contact.