To add a database to one of your projects follow these four steps

  1. open your project’s details
  2. scroll down to the Databases section
  3. select the database of your choice from the list Database selection in project details

  4. confirm your selection by clicking on the Connect a database button Connect a database in project details

This will provision a new database for your project, attach it to it and then restart all your processes, in order to give them access to the new database.