You can initiate a chat with a contact either by double clicking that contact in the contacts list, either right double click on the contact and choose "Send message on Alonia" option, either pushing

button from Rapid access when the contact is selected.
Initially a new chat window will open with a new tab close to the Contact details tab. If you already have an initiated tab. If you already have a chat initiated with that contact that chat will select automatically and will allow you to send messages in the existing window.
You can choose to continue the chat from the application or you can detach this window from the application with

Detach chat window right down button.
The chat window contains text format buttons (font style, font size, dimension, color) as well as sending buzz messages and emoticons inserting by pushing the blue image and they will be displayed up to the bar.