DESKTOP VERSION:
(Go to app version)
(Go to app version)
Click on the meeting in the
    calendar.
Then click on the link "Export
        to calendar" on the left:

When you click the link, you
        download an .ics-file that will go to your
        Downloads. 
This is what it looks like
            in the browser:

Open the downloaded file and
        follow the instructions of your email
        client. You may be asked to confirm that
        you trust the source of the file.

Click on the meeting in the
    calendar, and then click "Export to
    calendar". 

Press "OK" to allow access to your
    calendar. 

Click "Add". 
The event will now appear in your
    calendar. 

