Deleting books from kobo ereader
I am trying to delete books from my kobo ereader that I have got from:
1. free epubs from project gutenberg downloaded onto reader using calibre.
2. epubs from a public library downloaded onto ereader using adobe digital editions. these epubs should disappear from my laptop after their loan period, not sure how to delete them from the ereader.
As these epubs have not been bought from the kobo online store they do not appear in my library on the kobo website and I don't know how to delete them from my ereader???
Has anyone got any ideas on how I can do this? Many thanks.