[howardl]

When skyping I can see the person but they can't see me,
Where in the settings do I look at to fix it?

[Mustabuster]

Check whether you can update your profile picture using the camera.

If yes then you've probably just called them rather than video called them. I think during a call there is an option to enable video. I had this same problem in my first skype call.

[chenks]

you need to check the skype app settings to ensure you have it set to use the imac webcam.