I'm finally using a Ectaco jetBook and have looked up the manual. It mentions Dictionaries but I don't seem to have any. Were these an add-on?

EDIT: Okay. I see I have dictionaries for the text books that came with the jetBook for not for the sideloaded ePubs. The dictionary option doesn't come up in ePubs. (Kind of like the original Kobo WiFi won't bring up a dictionary for sideloaded ePubs.) I'm guessing there is no way to change this?