There are several ways to connect to a Klaxoon activity:
From a link
The presenter has shared a link with you, in the form of "https://app.klaxoon.com/join/___". A simple click takes you to the activity.
From an access code
The access code (a sequence of 7 characters) allows you to access an activity.
Discover the 3 ways to access:
1 - Simply enter it by clicking on the following link: Participate in an activity
2 - From the Klaxoon suite, click on the "Join" button (top right)
3 - Or, if you're already logged in to Klaxoon, from your home page (top right).
To find out more, read this article: Join an activity