Attachments, Messages & Emojis: Bottom Center
Attachments - Click on the paperclip to send files (PDFs, Jpegs, etc.). This section is similar to adding an attachment to an email.
Messages - This section is where you would type your message to the room or to the individual to whom you have highlighted on the left side of the page.
Emojis - Express yourself with emojis, just like on facebook or texts.