Creating a Skype video call with multiple participants is essentially just creating a Skype group conversation, and then calling all the participants. Skype's interface has a tool for creating group conversations and adding people. Once the group is set up, it works like any other Skype conversation.
Click Contacts followed by Create New Group in the Skype main window.
Click Empty Group in the conversation window's header to bring up the group profile.
Click the Edit button by the group name and enter a name for your group.
Click the Add People button on the group conversation window.
Select everyone you want to add to the call using the check-boxes next to their names, then click Add to Group.
Click the Video Call button to send a video call to everyone in the group.