What kind of device are you using?
This tutorial was written on iOS, but it should translate to Android.
You may be prompted to allow access to camera.
Choose either Join with Video or Join without Video
This tutorial was written on Google Chrome for PC, your download location may vary per device or browser.
Zoom will play a little ringtone for you to hear. Change the speaker device until you hear it with either your headphones or computer speakers.
Press Yes once you are satisfied and heard the ringtone.
Change the microphone device until you speak and hear it back with either your headphones or computer speakers.
Press Yes once you are satisfied and heard your voice.
If you do not have a microphone detected, you can skip this step.
Check mark: Automatically join audio by computer when joining a meeting
Then: Join with Computer Audio
Congrats! If you see this screen, you have completed installation! Click on Leave Meeting to leave.