In order to quickly access frequently used contacts, use the favourites.
You can add contacts to or remove them from the favourites.
The favourites are displayed on top of the buddy list.
How to use the favourites:
If the buddy list is closed, open it.
Hover over a contact in the buddy list. Next to the contact, icons for starting a conversation are displayed.
iconAdditionally, the contact will be displayed in the buddy list under Favourites.
In order to remove a contact from the favourites, hover over a contact under Favourites. Click the icon.