3- Enter your extension: sent to you in a email from 3CXFor exapmple 2100 and then you password p: kZtp5iEH8q
This is unique to each classroom and teachers.
4- Once logged on You'll see "install 3CX Installer for Chrome"
Then add to Chrome,

5- Once that is completed, Please activate the extension from the main 3cx page
6- Click on the blue phone icon on the top right hand corner of the browser and the dialer will open up.
Once opened you'll see existing extension - please move to Keypad and dial your parents.
Then click on the keypad
You can now make calls from your laptop and use extensions to call/text your colleagues right from the web extension.