Do you have a URL to that PDF, so that we can see the exact directions and also the context, to which they apply?
Good luck, and let us know a bit more please.
Could you cite the location in the Adobe Help PDF file where you are seeing what you describe?
google ADOBE PREMIERE ELEMENTS11 CHANGING SPEED AND DURATION. Unfortunately not able to copy and paste link on here. This is 11 ,i have 12 but suppose it doesnt make much difference for this.