Click on "Minecraft Realms"
You might want to click on "Options" and change to your learning language. Set language to German if you are learning German. Minecraft can be played in many languages.
Click on the flashing envelope to the top right of "MINECRAFT REALMS"
You must have been invited to see this envelope. Contact firstname.lastname@example.org if you are a student or a teacher and have not been invited.
Click on the Green Checkmark
Select "WROFF education" and click on "Play"
You may have to chang version of the game if you have problems. This you do before you press PLAY
The world will be changed periodically