@Paxloria first go to your reading list and select the story you want to delete
or
1. go to the story let's suppose here 'undermind' there is this blue button add to library or added to library
2.click on that blue button and you will see an edit option
3.at edit list there are two options a. Edit lists
b.Reading
4.After clicking at reading option you will see the series you have saved
5.check out the box of story you want to delete
6. press delete
:)