Facebook Messenger video call is incredibly simple to use. It's likely that you already have Facebook, in which case, most of the work is already done. Facebook Messenger's purpose it to connect families and improve work flow. It has loads of added filters that can make a lesson more fun for younger children.
First, if you haven't already, you will need to download the Facebook Messenger app from the Google Play Store or the App Store
Second, launch the app and give Facebook Messenger permission to access your camera and your microphone
Third, if you don't already have a Facebook account, you will need to create one
Fourth, sign into your Facebook account on the Facebook Messenger app
Fifth, scroll until you see the contact that you want to call, or use the search bar at the top to search someone's name
Sixth, tap on that person
Seventh, press the camera icon in the top right hand coroner
That is it. You are all set up. You might want to become friends with your teacher on Facebook so that you don't run into any problems. It will also automatically add your teacher to your contacts and add you to their contacts. This will make it easier for your teacher to call you in the future.
Don't give up and you will achieve your goals. Remember, Everyone Great has a Beginning.