Before your scheduled conversation, open it in the My Activities list.
You will see the names of the participant and their Skype names.
Add their Skype name to your contact list.
At the scheduled time, start a conference call on Skype with the participant. They will be waiting for you to call. If they are not online when you call, it is their responsibility to join in late.
You must have Skype installed on your computer to tutor on LingQ.