You can contact the members of the Gregorio project by several means:
Two mailing lists are available:
- email@example.com, the users' list. Here you can ask your questions about gregorio usage and get help. You can search through the archives for this list here. There is also a searchable archive of past discussions on the previous incarnation of this list.
- firstname.lastname@example.org, the developers' list. You can use this list to report bugs if you don't have a GitHub account (see below). This is also the list to use if you're interested in getting involved in development.
In order to subscribe to those lists, please see the group page. You will need to sign in to Google and then click the "Join group to post" button.
The old user mailing list is also accesible as a GMane news feed.
When requesting help with some feature of Gregorio, please try to assemble a minimal working example (MWE) showing the progress you've made thus far. Such files make it easier for people to dive into helping you with your particular problem because they don't have to go through the process of recreating your particular circumstances in the first place.
An IRC channel is available on Freenode, with the channel name