Salam
When you post code, sample data, console output or error messages please format it as code using the preformatted text button ( </> ). Simply place your cursor on an empty line, click the button and paste your code.
Thanks in advance
Guide to Posting Code - Redux <---- Click 
( !! Sometimes the preformatted text button hides behind the settings gear symbol. )
The name of a command in PowerShell is “cmdlet” - no commandlet!!
The cmdlet Set-VMNetworkConfiguration is part of the Hyper-V PowerShell module. Do you have this module installed on the machine where you try to run this command?
And BTW: This site is in english. So there are probably very very few people speaking french. So the link you posted is not that helpful. 