Je croix que ouvrir sur le serveur (french) is open in server (english)
When you open in server a document, the document and objects cannot be edited.
You can only view.
from online help, serach for open in server
When opening documents as a client to QlikView Server you will be restricted in what you can do with the document compared to when you open local documents. As a client you may not add or delete sheets and sheet objects. Furthermore you cannot access properties dialogs, change macros, access the script, reload data or save the document.
To do these change (add sheet, etc) you have to open the qlik doc from file system.
If you have qlikview desktop installed on the server open the doc as you do on your desktop
Or if you have access from your pc desktop to the server file system, open as you do on your desktop