Sign up to get started at https://admin.weaselspark.com/. Then you have access to the list of sites that can be tracked. click on the + icon, circled in red in the image below.
The following pop-up will then appear:
When you click on the + button of the pop-up, the site will be added to the list and you will have an ID inserted in the Weasel script.
Then retrieve the weasel script and embed it on your website.
It is also possible to implement the script locally, it is necessary to install the following plug-ins on the browsers:
These plug-ins will add the Weasel Spark icon in the upper-right corner of the screen to re-link a bug or propose a new feature.