First, note the Connection Type list in the dialog box. This is the list of database connections that the Pentaho Metadata Editor and metadata models can support. The list is quite extensive. If you do not see your database in the Connection Type list, you may be able to add it.
To add a new database type, you must copy the JDBC driver archive for your database into the PME install directory ...\metadata-editor\lib. Restart the Pentaho Metadata Editor, and you will see your database in the Connection Type list.