Check Your Media Settings

For Mac:

Mac OS X Microphone Settings

For Windows:

1. Go to Start and search for microphone setup
2. When the microphone setup opens, you may be prompted to fix your microphone (even if it’s previously been working)
3. Walk through the guided microphone setup/fix
4. When done, go back to Chrome and refresh the page where the online meeting is taking place.

Or, try vising a website for more help.

Because we all use different webcams, I cannot provide specific instructions here.  You will need to do a search and make sure your camera is working.  Sometimes in the doxy.me or Skype program you have to accept that the program access your camera and microphone.