Thanks for your interest in the development of Delphes.

The Delphes development model is community-based. Users willing to participate are encouraged to fork Delphes Git repository and to submit pull requests for improvements and bug fixes. The Delphes core development team from the CP3 centre of the Université catholique de Louvain is in charge of the maintenance, releases, and general support to users via the ticket system.

Questions, suggestions and bug reports can be made through the ticket system available on our website.

CP3 home page: 
https://uclouvain.be/en/research-institutes/irmp/cp3

Ticket system (you will have to register first): 
https://cp3.irmp.ucl.ac.be/projects/delphes/newticket

Documentation is collected in the Workbook: 
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook

A good starting point is the Quick Tour:
https://cp3.irmp.ucl.ac.be/projects/delphes/wiki/WorkBook/QuickTour