Changer modèle sur formulaire existant jotform

http://festivaldesarts.org/inscriptionenligne/

Je n'arrive pas à enlever la barre grise qui appartient à un modèle. Veux appliquer un modèle vierge.

What gray bar are you referring to? I look your form provided on this link: http://festivaldesarts.org/inscriptionenligne/, but I could not identify it.

Please send us a screenshot to see what you are referring to, see this guide: http://www.jotform.com/answers/414264-How-to-include-screenshot-image-in-the-support-forum

Also, if you want to modify your template, like setting a blank background, you can accomplish that with the Form Designer feature: