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 GitLab web site: https://gitlab.com/QEF/q-e.
The recommended place where to ask questions about installation and usage of QUANTUM ESPRESSO, and to report problems, is the mailing list firstname.lastname@example.org. Here you can obtain help from the developers and from knowledgeable users. You have to be subscribed (see the ``Contacts'' section of the web site) in order to post to the users' list. Please check your spam folder if you do not get a confirmation message when subscribing.
Please read the guidelines for posting, section 1.3! PLEASE NOTE: only messages that appear to come from the registered user's e-mail address, in its exact form, will be accepted. In case of trouble, carefully check that your return e-mail is the correct one (i.e. the one you used to subscribe). Please also note that since some time the correct functioning of mailing list is frequently disrupted by policy changes at large commercial providers. There is not much we can do about that.
If you need to contact the developers for specific questions about coding, proposals, offers of help, etc., you may either post an ``Issue'' to GitLab, or send a message to the developers' mailing list email@example.com. Please do not post general questions there: they will be ignored.