To add Klaxoon to a chat from Microsoft Teams, simply follow these steps:

Go to the Teams chat you want to add Klaxoon to, then click on the "+" in the tabs above your chat and finally "Add tab":

Then, search for the Klaxoon app.
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You can either write the name "Klaxoon", or find it in the drop-down list if you have already used it.

Click on the "Klaxoon logo", then you will access the "Activity picker".

Then select the activity you want to share in the chat by clicking on the title, and then, click on the "Save" button

Your activity is now available in your conversation:

Your participants will be able to join it by entering their email or their nickname, depending on the parameters defined when the activity was created.