There is a X in the top right of each icon..
Seems like we can't remove a single bookmark. We can remove by manga only. So I open the ones I wanna keep before delete, then bookmark the one I just opened.
Before we got the album system, I ever used bookmark to keep the impressive scenes. I just deleted lot of them out.
If you want delete a bookmark and simultaneously keep the manga you can only put the bookmark in another page ....
This is what I do also, was just curious if there was a simpler way, seems there isn't. Thanks for all the replies.
Since bookmarks are grouped by manga I couldn't figure out how to remove a single bookmark. There is just 'remove all'. Does anybody know how?