From your mailbox click the "calendar" icon. Double click on the invite you want to edit. When you are done, click "save" on the bottom. 

In Calendar, click the "actions for" icon next to the calendar you'd like to share and select "Share/Permissions" from the dropdown menu. Decide if you want to invite people by email or share a link. To invite people via email type in a name or email address in the box. Then click "Viewer" and select the level of permissions you'd like to assign to the person you are sharing your address book with. You can also type a message if you'd like and click "Save". The person you shared your calendar with will receive an email with a link to view it.

To share a link, select "Anyone with the link and invited people" from the dropdown menu and click "Copy link" and share via email, text, instant message or any other way you communicate.

There are four different ways to add new calendars.

In your calendar, click the "+" next to "My calendars" and select "Add new calendar". Type a name for your new calendar and tick the box next to "Add as public calendar" if you want to make it available to others in your company. 

To Subscribe to a calendar someone has shared with you, click "Subscribe to shared calendar" and the calendars that have been shared with you appear. Click the button next to the calendar you'd like to display and then click "Save".

To use an iCal link, click "From URL" and enter the iCal URL. Then click "Subscribe". Your calendar will appear under My calendars.

To import a calendar from a file click "Import" and then click "Upload file", enter the new imported calendar name and then click "Import".

Click on the gear icon in the top right corner and select "All settings". Click "Calendar" on the left and select "favorite timezones". Click the + icon, select the time zones from the dropdown menu and click "Add". 

From your mailbox, click on the "calendar" icon on the top. In the top right corner click on the tab and under dropdown options you can then select one from the six available views for your calendar (day, workweek, week, month, year and list). 

Open the "calendar" icon on the top. Click on the Action button called  "New appointment" on the left and choose "Scheduling" from the dropdown. You can now search for a contact in the search bar on the left to identify a time slot that fits for an appointment. Simply click and drag the desired time and create a new appointment.