Questions and answers cannot be edited at this time, however you can delete any of your prior posts.
If you are logged into your account that you originally used to submit the question or answer, navigate to your Advice post. Once you are on the page where the question or answer was posted, select the link to "Delete".
Find your question under 'Activity' and then click on the hyperlinked question to open the page.
Click 'Delete this question' and it will immediately be removed.
Find the question you submitted an answer to under 'Activity' and then click on the hyperlinked question to open the page.
You'll see your answer appear under the question. Click 'Delete' and your answer will remove immediately.