Its not
WikiAnswers is located at: www.wikianswers.com (not too hard!).
You can't. Just make a guess.
To find your contributions, you can use the link on the blue bar to the left; titled "My Contributions".
WikiAnswers ranks your contributions by how many questions, answers, edits and community work you contribute to the WikiAnswers community.
If you are a registered user, you can go to your contributions page by clicking on "My contributions" on the blue sidebar. Then chose "filter by: Questions Asked" and you will see a list of all the questions that you have asked on WikiAnswers.
Many senior supervisors and users who been on for a very long time. It is not hard to get to get that number.
Yes, you lose the Bronze Contributor badge on WikiAnswers when you reach 5,000 contributions. Then, after 5,000 contributions, you become a Silver Contributor, which is a good sign that tells you that you have been working hard and now you get a new reward for it all.
WikiAnswers does not pay for contributions. All contributors and supervisors are volunteers who love the site concept.
You can't
Answer questions.
You can find your contribution and edit it out or you can email (giving the URL of the question and what you want them to do) to: WikiAnswers @ Answers.com and they will do it for you
If you have logged-in to WikiAnswers with a user id and password you can look at 'My Contributions' in the 'My Pages' area. You will find this at the bottom of the blue area on the left hand side of most WikiAnswers pages.