How do you send chat invites?

Answer 1

On the left sidebar, make sure you have the speech bubble icon highlighted at the bottom (not the "..."). Then use the search box to search for someone in your contacts. Hover over the name, and click "invite to chat".

Answer 2

at the bottom right corner, it says 'chat'. click on that and a list of friends pops up.if you cant find the person you want to talk with, you can either search or you might not be friends with them.