If you are the conference host, you can drop other parties from a conference, otherwise you can only drop yourself.
To drop a party from the conference:
1.In the Calls gadget, hover your cursor over the participant that you want to drop. A number of call functions icons appear next to the parties name.
2.Click 
Drop. The participants icon changes to 
to indicate that the participants is no longer in the conference.
To drop all other parties:
1.In the Calls gadget, click 
Drop All.
To drop yourself from the conference:
1.In the Calls gadget, click Drop.