If you are interested in using these "softphone" features (it's actually pretty cool) you just need to quickly register yourself here (only a few fields).
Once that is done, you can do one of the two options to answer and/or make calls through it:
Website Option: Login to the website (my.jive.com) using the credentials you signed up with or use the Sign-in w/ Google option.
Mobile App Option: Download the mobile app, "GoToConnect" and use your credentials to sign in: Here are the links to the Android smartphone or the Apple iPhone app download pages.
Let us know if you run into any problems via the helpdesk@emuhsd.org account and we'll do our best to remotely assist you.