You can send Instant Messages to anyone on your buddy list.
Sending
To send an Instant Message, simply double-click on the name of the desired recipient. That's it! When the message window opens, simply type your message and hit Enter or click Send.
Receiving
When a Qnext or IM contact sends you an Instant Message, they will jump to the top of your contact list. A sound will play and there will be a flashing message icon in the system tray. Double-click the Qnext Friend's name or the flashing icon to open and/or reply to the message. In Windows versions of Qnext, the message will automatically open and be minimized to the task bar.
Extras
By default, Qnext logs your message history with each contact. To stop logging history with a contact, view or delete the history, or choose how your history with a contact is displayed, click the Contact Settings icon inside the message window.

You can customize other message options, like spellchecker, message sounds and more, by clicking the Options button inside the message window.