Can I presume you are asking about deleting you AskBob account?
If it is you askbob account you are looking to delete here are the steps.
1) Log in
2) Click on the Members Link
3) On the right side menu click My Page
4) Click the Edit tab near the top of the page
5) On the edit page there is a Save and Delete at the bottom. Click Delete. You wil get a conformation screen where you need to select Delete a second time.