First, add links to your website, as described in step 2.

Next, navigate to your settings in the site dashboard, and scroll down to Custom Code (this is not available with a free version of Wix) :

Faites défiler la page jusqu'à la section Corps - Fin, puis cliquez sur Ajouter un code.

Add your widget's code in the Code snippet section, enter a name like Plannit Widget and click Apply.

Do the same for the Plannit Bot script and you're done.