Get started with Google Calendar
Your Google account gives you access to a calendar, from which you'll assign Holly the appointments she has to manage.
To access your calendar:
FROM YOUR COMPUTER
Visit Google Calendar.
If you already have a Google Account, sign in. If you don't have one yet, click Create an account.
Once you sign in, you'll be taken to Google Calendar.
To change any of your settings, go to the top right corner and click Settings.
This is the settings symbol.
FROM AN ANDROID DEVICE
Visit the Google Calendar page on Google Play.
Tap Install.
Open the app and sign in with your Google Account.
FROM AN iOS DEVICE (iPhone & iPad)
Visit the Google Calendar page on iTunes.
Tap Get.
Open the app and sign in with your Google Account.
SOURCE: Google Support