Thx for your answer Agera !
In fact, I found the solution here : Wrong Email address to log into Creative Cloud Desktop, How do i switch to my email address?
Delete the OPM.db file :
- Close the Creative Cloud application.
- Navigate to the OOBE folder.
Mac OS: /Users/[user name]/Library/Application Support/Adobe/OOBE - Delete the opm.db file.
- Launch Creative Cloud.
If you are not able to find that file, please check the following link, that may be because your library is hidden.
http://helpx.adobe.com/x-productkb/global/access-hidden-user-library-files.html
It works for me, hourra !
Thx again !