To categorize a question, click the "Edit Categories" link just under the question title. You can also click 'Edit categories' underneath the 'question tools' of the blue left toolbar. For more information on categorizing, please see the Related Links section of this answer.
mostly because it doesn't have a category
No, there is not a specific "spite relationships" category on WikiAnswers. There is a standard "Relationships" category. You can further categorize into "friendship" or "marriage", for example, if your question is related to one of those.
Yes, many people on WikiAnswers can give advice on an eating disorder. If you ask your problem in a different question and categorize it into the correct category, there is bound to be some WikiAnswers contributor willing to answer your question.
Certainly. Just make sure to categorize your question in the physics category and someone who knows physics well will try to respond.
Each time you make a change on WikiAnswers it counts as a contribution. Each question you answer, edit, or categorize counts as a contribution. If you look at your own profile, you'll have an opportunity to click on your contributions and see a list of all that you've done so far.
WikiAnswers does not assume categories. When you open the categorize tool or ask a question and have to categorize it the tool takes keywords from what the question is asking and gives you suggestions on where to add the question to.
Yes you can
Not exactly... though WikiAnswers can help you with translations. You can ask questions such as 'How do you say 'eat' in Greek?' to the community (categorize it in 'English to Greek'), and wait for an answer.
Sometimes it can take a while. There are over 7,000 categories, and who knows how many questions. What I would suggest is to rephrase the question and ask it again. Make sure to categorize the question under the best category/categories [up to 3], that it would fall under.
There were not enough of them. Or maybe your question was about the ships? Be careful when you categorize your question.
Yes it does.
It may take time before your question is answered. There is a community of people out there waiting to answer your question, but you have to give it the best chance of being noticed. If you categorize it correctly, use proper spelling and grammar, there is a better chance it will be featured on the homepage or answered quicker.