ProjectSend uses a configuration file that includes your database connection settings as well as other personal parameters. This file is never included in the app's zip file to make sure yours is not overwritten.
The location of the file is
It is unlikely that you'll need to create this file manually, as the installer will detect if it is missing, and launch a wizard that will help you create it while testing your database credentials at the same time.
If for some reason you decide to create it yourself, a template exists at