You are looking at documentation for an older release. Not what you want? See the current release documentation.
Follow one of the following ways:
The first way
Right-click your desired question, then select Delete from the drop-down menu.
The second way
Click on the Action bar, then click corresponding to the question you want to delete.
The third way
Open a desired question, then click and select Delete.
Click OK in the confirmation message to accept your deletion.