@Souheil Mhiri Welcome to the Microsoft Q&A forum, Thanks for posting your question.
To connect your Prestashop 1.7.5.2 website to the Azure MySQL database, you can use PHP code to connect to the database.
You can find a quickstart guide on how to connect to Azure Database for MySQL using PHP
https://learn.microsoft.com/en-us/azure/mysql/single-server/connect-php
Can you please share what is the error you are getting and how you tried to connect?
Regards
Geetha