If you mean a comment on a discussion page, contact a CA or Supervisor and they'll be glad to remove it for you. If you mean on boards, then click 'delete' or if you don't have a delete button, contact a CA or Supervisor.
There is no way to erase your own history - or that of any other user - on WikiAnswers.
You can't
When somebody answers a question and you think it is not true or not enough information, then there is a orange button below it that says improve answer. Then you can erase that answer or write below it. If you have a suggestion or comment on WikiAnswers, you can post it to the Community Forum. These forums are read regularly by staff as well as the community.
No.
Actually you can't. Even I tried it.
Do not comment plagiarism ...
The WikiAnswers team can take an indefinite amount of time to erase useless or incomplete answers. Questions on WikiAnswers are answered by users of the website, not necessarily staff members. If you see a useless answer, remove it or flag it so that other users can see that the answer needs to be improved.
Minutes
No, all aspects of this site are free.
If you have something to add to the answer, click on the Improve Answer button. If you have a comment or want additional information, click on Discuss Question.
Yes, but should only do so if the answer is inflammatory, inaccurate, or inappropriate.
WikiAnswers does not comment on people's integrity.