Open the question(s) and look to the rightof the answerbox. That's where you'll find the button to delete it (trashcan).
You'll have to do the questions one by one though.
You can also change your username here: http://www.experienceproject.com/member_account_settings.php
click on 'user account' in the left column.
That's where you change your username (top of page)
You can change your username
Go to the post and click where it says delete
The little trash can is the delete button here!
Happy house cleaning!!!
You can't delete stuff they will be stuck here forever and ever and everyone is going to know about you.
It says you can delete all your stuff at the bottom of it.