Introduction
In your contacts list or search results, double-click the person you wish to send an instant message to.
Instructions
1) In your contacts list or search results, double-click on the person to whom you wish to send an IM.
NOTE: Alternatively, you can place the mouse cursor over the picture (or picture display area) of the person to whom you wish to send an IM, and then click the "Send an IM" button.
2) Type your message. When you want to send your message click the "Send" button.
Outcome
You have successfully sent an instant message in Skype for Business.