If you are recording with HD video you can find the microphone setting in options.
On the recording bar, before you start recording, select the microphone icon and choose the audio input you want to use. You can only record sound for HD videos. GIFs do not record with with sound.
If you are recording on Full-Screen mode using our Windows desktop application you will find the audio settings on the Screencast screen.
On the recording screen, you can select your audio option.
If you are screen recording using Droplr’s chrome extension, click on show Advanced options and select the microphone option to change your input.