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This should be available on the main Skype screen. You should now see on your screen one symbol that looks like a video camera and another that looks like a telephone. You will place a video call if you click on the camera and an audio only call if you click on the telephone icon. Determine which option you prefer and make the call. To clarify, all Skype-to-Skype calls (or calls to tablets or smartphones running the Skype app) that are transmitted solely using the Internet are free. Those calls you make to land-line or cell phones will be charged. On the Skype calling window there should be a red icon with a downward facing telephone on it. Click this to end the call.
Open the Skype program. Enter username and password and login. Find the person you want to talk with on your Contacts list. Click on the name you would like to contact. End the call when you are done.