In the chat room, if you press the three dots icon in the top right corner, a menu will appear.

If you decide you want to block someone while chatting, just click on those three dots on right upper corner and select "Block this user."

A confirmation screen will pop up, and you can confirm by pressing "Block."

If you ever wish to unblock a user, please refer to this link for instructions:  https://dreamfora.freshdesk.com/support/solutions/articles/43000716895-how-to-view-blocked-accounts-and-how-to-unblock-users-

*Please note that unblocking cannot be done within the Chatting feature. Also, be aware that (un)blocking someone in Chatting and within the Feed are interconnected.