Hello Christina,
Problems with using Moodle can be reported in two places.
You can report them in the appropriate forum (like here for problems dealing with Questions or Quiz). This is a good place to get (almost) immediate responses from fellow moodlers who either experience the same problem or (even better) who can provide a solution. Reporting problems in the forums is easy, you do not have to follow strict rules, but your problem is not assigned to anyone in particular.
If it is clear that the problem is a bug
, then it should (also) be reported in the bug tracker, located at http://tracker.moodle.org/ The bug tracker can also be used for suggesting improvements. Reporting problems (bugs) in the bug tracker has to obey stricter rules. You have to describe your problem step by step, and you have to make sure it is a bug, i.e. you have tested it thoroughly, on several platforms, possibly on several Moodle versions, and it must be reproducible.
In either case, the best way to get an answer to any problem is to give a maximum of details, to be very clear what exactly you expect to get and what you get instead. It can help to attach a file (e.g. the complete text of a question or quiz or a screen shot).
Joseph
PS. I have questions for your answers.