Setting up Hotjar is done in a few steps on the Shopware site.
To activate Hotjar, you have to go to
Extensions > My Extensions > Apps in the admin and then at the app "Hotjar" right click on
... > Configuration on the right.
Now you are in the settings for the app. Next, you just need to enter your
Hotjar ID in the input field and click on the
Save button. That's all!