Share your iPhone using Quicktime on Mac
1. Plug in your iPhone and "Trust this computer" if asked
2. Open Quicktime on your computer
3. From the menu bar, choose File > New Movie Recording
4. Next to the record button, select your iPhone.
If you don't see your phone, make sure it is unlocked, and try restarting Quicktime.
5. Return to YouNow, click Continue, and select your phone from the Application Window options