Classes and the Class Diagram

Hi
I am trying to design some classes with the class diagram. I am doing this via a tutorial, but one part of this tutorial is not clear.Please review this picture
(http://imar.spaanjaars.com/Images/Articles/N-LayerDesign/ClassDiagramDal.jpg). How do I set up these Methods. i know how to add a method, but I can't seem to add the brackets, colon or word after.
EG my method will just say Delete. The one pictured above says Delete(): bool   How do i get the (): bool part?
Any ideas?
Thank you
Dave
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