Should I answer students' questions immediately or teach them to ask better questions?
Being a student myself I know how frustrating it can be to work with technics or facilities you don't know enough about. Sometimes this means asking fully detailed questions can be tricky.

But there is a difference between a student that tries to ask a question to get help with their problem, and one that just declares that they have a problem and thinks it is another persons business to deal with it. What you posted above is the latter. 
They have encountered a problem and instead of trying to get help to solve it they try to make you solve it. That might even be clever, because as long as you DO solve the problem, they get maximum effect with a minimum of effort. And as soon as students realise that, even the good students won't bother to read your FAQs anymore, because it is a waste of time, when you obviously can identify and solve a problem as soon as they write "Help, I have a problem." 

Additionally you have to keep in mind, that as a student you often take from the experience that people don't respond to your question of, "can anyone help me" as indicating that this person is just checking, whether someone responds. It is not meant to be a question, but a phrase to start a communication about the problem. That is something adapted from face to face communication. In the real world you don't go to people and start with a 5 minute monologue to your problem, you ask "Hey would you help me?" Wait for a "Sure what is it." And than give your monologue.

So what I read above is not a question it is the reflex of a student to a problem. Before even thinking they are posting (in my generation a common reflex in every situation - we are the tldr - too long didn't read generation). If I were you I would respond with a reflex. Just answer with a standard answer that explains, that you need more detail to help. Students who get frustrated by this are already frustrated and beyond your reach. 
If on the other hand a student tried to ask a proper question and just failed, you should provide the answer and give a hint on how his question could have been better. 

How frustrated your student will be is less a question of what you respond, than of how you
respond. "I could solve your problem, but I wont because of your stupid question" is of course frustrating. But even in a standard answer you can demonstrate that you care, that you take the other person and his time serious, that you would like to help and that you need more information in order to do so. I would try to phrase it, but as you undoubtedly realised I'm not a native English speaker, so I leave that to you. Just don't advertise the fact that you are trying to teach them something.