The ScreenPal extension will automatically select your operating system's default webcam for recording.  You can choose alternate devices by clicking either the Record in Browser button on the extension, or the ScreenPal icon in either a text box or webpage within your Google Chrome or Microsoft Edge browser to display these options:

Click the arrow next to Narration to change your microphone. 

Click the arrow next to Camera to select a different camera.

Still not working?  Be sure you have enabled permissions for your camera and microphone within your browser. To enable your camera and microphone for the ScreenPal extension, please see Chrome Extension: My webcam or mic isn't working.