The web site for QUANTUM ESPRESSO is http://www.quantum-espresso.org/. Releases and patches can be downloaded from this site or following the links contained in it. The main entry point for developers is the QE-forge web site: http://qe-forge.org/, and in particular the page dedicated to the QUANTUM ESPRESSO project: qe-forge.org/gf/project/q-e/.
The recommended place where to ask questions about installation and usage of QUANTUM ESPRESSO, and to report problems, is the pw_forum mailing list: pw_forum@pwscf.org. Here you can obtain help from the developers and from knowledgeable users. You have to be subscribed (see ``Contacts'' section of the web site) in order to post to the pw_forum list. Please read the guidelines for posting, section 1.3! NOTA BENE: only messages that appear to come from the registered user's e-mail address, in its exact form, will be accepted. Messages "waiting for moderator approval" are automatically deleted with no further processing (sorry, too much spam). In case of trouble, carefully check that your return e-mail is the correct one (i.e. the one you used to subscribe).
Since pw_forum has a sizable traffic, an alternative low-traffic list, pw_users@pwscf.org, is provided for those interested only in QUANTUM ESPRESSO-related news, such as e.g. announcements of new versions, tutorials, etc.. You can subscribe (but not post) to this list from the web site, ``Contacts'' section.
If you need to contact the developers for specific questions about coding, proposals, offers of help, etc., please send a message to the developers' mailing list: q-e-developers@qe-forge.org. Do not post general questions: they will be ignored.