You must be first signed into your WikiAnswers account. Go to your profile page and on the right you will see a bunch of numbers next to different things you could do for the site. Click the option "View All" to see all your contributions. You can also hit "My Contributions" from the left sidebar.
Its not
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.
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.
Unfortunately there is no way transfer contributions made as an unregistered user to a registered WikiAnswers account.
There is no end to the amount of contributions you can make.