Deleting a new created line

How can I delete a line (cycleway for example), which I´ve just created?
Right click does not work, as there is always the error message “Cant be deleted, we cant see enough yet”

I’m pretty sure you can’t delete long ways in the iD editor except by chopping them into shorter sections. I think you were referring to your Changeset: 107621915 with the two long duplicated highways one atop the other, I’ve removed them for you with the JOSM editor. With JOSM you can download a large area covering a long highway, (might take several downloads), then it can be deleted. Regards.

Press [Z] and then you can delete.