Hi, then you might need to write to customer service, email@example.com, to cancel the order? I can't see or affect orders other than my personal ones: I'm not really in the loop at all with yours.
When you're typing in the inscription, it should show you the live 3D model, with the text on it, in the picture at left. So while I can't check whether that's working, if it is you should see a drawing of a Klein bottle with that inscription. If you're not seeing that, it hasn't worked.
Again sorry for the confusion. Hope this helps!