Case 1. Camera indicator is yellow or red, other indicators are green.

Solution 1. Ensure that you have enough light for a high-quality stream. If you are using virtual camera (OBS or any other), make sure that your camera settings in virtual camera software is correct.

Case 2. Camera indicator is yellow or red, CPU(1) and/or Encoder(2) indicators are red. 

Solution 2.  Close unnecessary applications or decrease video quality.  Use your Windows task manager to understand what applications have high CPU capacity and close them if it is possible. Reduce video resolution of FPS using Streamster main settings or encoder video quality using additional settings.