I can't stop scheduled iMessage

I made one such scheduled message a year ago and now I can't stop it. I can't find EDIT button ot cansel sending. Where do I find the option to stop sending? When i hold on message in the menu i dont have Edit/Cancell or other option to stop sending, only: Reply/Attach/Copy/Translate/Select and More. If i click More there is only Delete option ... The phone is updated to 26.