login to datafabric manager console and do the following:
1. dfm host add <ip of filer>
This will associate your filer with dfm.
next you need to set the credentials of the filer in DFM:
2. dfm host set hostlogin=<login name> hostpassword=<password> hostndmplogin=<login name> hostndmppassword=<password>
Let me know if you need any other help.