If you are a registered user with an e-mail address on file, an e-mail will be sent to you whenever there is a change to your question.
how are you notified of answer
A lot of them.
WikiAnswers does alert you when a question you asked has been answered. At the home page and on question pages, the bell used for notifications at the top-right of the page will have a red notification box to let you know about questions you've asked that have been answered.
If you asked the question while you were logged in, you will be notified by e-mail that your question has been answered. When you ask a question, it is automatically placed in your watchlist. If you ask a question and it's already on Answers.com, but isn't answered, you can follow that question by clicking "Follow" in the blue column to the left of the question. Any question that you're following gets added to your watchlist, and you receive an e-mail about when it is answered or updated.
There will be a phrase that says this question has not been answered yet then click on answer this question that will be under that phrase
If you are a member, you get an e-mail giving you the link to your question, which has been answered. If you are not a member, become one now! It's free!if you are a member the site will send you an email to tell you that your question has been answered
Because you can't answer a question that has never been asked. Ideally, there there should only be two kinds of questions on WikiAnswers - those that have been answered, and those that will be answered. When a contributor comes across a question that hasn't been answered, and they know (or think they know) the answer, they will put it in. That is how the collection of questions and answers grows.
"Enter a question here" is the box for you to ask your new question on WikiAnswers, or to ask questions that may have already been asked and answered.
If it does not get answered, you just have to wait. If you do ask again,( which is not recommended) it will not get your answer any faster. If your question was spammed, or just plain nonsense, then your question would have been deleted, and it will never have been answered.
If your Questions have been answered than wikianswers will send you an email.
Well, Just like "that" - you just did it! Good Job!
Currently - the oldest question in the 'Questions about WikiAnswers' section is How did Microsoft impact WikiAnswers- posted on 25th May 2007.