Log-in to your personal Alexander Street Press account (create an account if you do not have one)
Find the film you are interested in, then click the Play icon.
Click on "Create Clip" icon
Select "automatic preview" check box if you want to automatically preview the clip
Enter a title and description
Select the start and end time
Select "only visible to you", then select either Public or Institutional depending on the use (if you select Public or Institutional, after you save the Clip it will give you an option to Share it).