Near the now reading u have edit or delete button click delete...
If you click on the manga, you should see 2 buttons saying “Edit” and “Delete.” You want to press the delete button.
When you go to the main page of the manga under the picture, info etc. there is an option to "edit".
There you can unsubscribe.
If you don't wanna remove it from your reading list you can just unsub so you won't receive notifications of it.
How do you 'unsubscribe' from a manga?? Like I once added a manga to my 'now reading list' but I don't want to continue reading it..how do I remove it..