Comment mettre notre propre template ?

Bonjour,
J'aimerais changer de template (fond d'écran) sur webnode et mettre mon propre template à la place. Mais voilà, quand je clique "import template", je reçois un message d'erreur :

The "config.xml" file doesn't exist.
Often, this error is caused by incorrectly created ZIP archive. The ZIP archive must be compressed not to contain a parent folder of the folder containing the template files. E.g. you have the template files in the "C:\template" folder. The path to the "config.xml" file is "C:\template\config.xml". The archive should be compressed as the file paths don't contain the "C:\template" part. So the "config.xml" file will be located in the root folder of the archive and its path will be just "config.xml". Besides, it is possible that there is a typo in the filename which you specified. Please correct the ZIP file.

Error code: 41

Je n'y comprend rien...s'il-vous-plaît aidez-moi, celui-là est très moche !