KOReader question

[ArizonaGuy]

I only installed KOReader perhaps 2 days ago on my Boox tablet so it is all pretty much brand new to me. I did some of the basic setup so I have been through the setup pages and did most of what I wanted. But there are some things in the setup process that I just could not figure out and chief among them is setting up a dictionary,

I went to the Search icon and opened the setup for the dictionary. I went to the download dictionary section and selected English, expecting a list of English dictionaries to use by highlighting specific words and expecting the dictionary definition to pop up, as that is what I see in other eReading apps. But the dictionaries listed all seemed to be either for specific specialties or English-to-Other-Language dictionaries. That is, translation dictionaries. All I want is a regular English language dictionary to use with KOReader.

Perhaps I am missing something here. The initial extracted KOReader app does not come with any default dictionary; at least the setup pages shows 0 installed dictionaries and highlight does not do anything. So my questions are (1) is it possible to install just a simple English dictionary? (2) If so, how? And (3) do definitions pop up automatically when words in a book are highlighted? Or do I have to open the dialog box and then type in the word I am looking for a definition for? My apologies for ending a sentence with a preposition ...