Regard Deleting Books

Hi 

I would like to know how I can delete books from the library 

I tried removing them but later when I open digital editions again 

it still appears and the same book creates a copy as well

Does it have anything to do with my ID registration? 

Also, I want to know how I can keep the books I download for a long period of time

Even when they are deleted from my computer, they still appear in the software

How do I delete books that I do not need from my computer that uses an authorised ID for digital editions?

I also tried uninstalling and reinstalling the software 

It still doesn't work out 

PLEASE LET ME KNOW AS SOON AS POSSIBLE because I need it for my studies.

I will be downloading them again later properly for use but as of now, I would like to know how to delete them from my account library.

thanks, and I hope to hear a response very soon.

AG