Got the fix in another post thread "https://communities.netapp.com/message/89897#89897" by Gamitabh:
The System Manager config file is in User preference folder.
All the stored details can be edited at "SystemManager.config" file present in the folder:
In Win-7 say for Administrator:
C:\Users\Administrator\NetApp\SystemManager\
In Linux say for root:
/root/NetApp/SystemManager/