If this video isn't working, it's also on YouTube. (NOTE: This video has no sound, only visuals).
This video walks through each step:
Click the link your teacher sent or enter the code on the Flipgrid site.
Log in with your Google account
Scroll down and click on the big green plus (+) button
Hit "Allow" to turn on your webcam
Hit the record button at the bottom to start recording. Use the tools to draw or add emojis.
Hit "Next" to preview your video
Hit "Next" to take your thumbnail image, or selfie.
Type your name and "Submit video"