You'll need to get the provider interface and set the parameters before trying to open the client dataset. Unfortunately there is no way to do this at design time, but it should work OK at run time. Here is some code that shows basically what you need to do:

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procedure TDBClientTest.Button3Click(Sender: TObject);
var
  Params: Variant;
begin
  ClientData.Provider := RemoteServer .GetProvider('ProviderName');
  Params := VarArrayCreate([0,  ], varVariant);
  Params[0] := VarArrayOf(['@InParam ',  0 ]);
  Params[ ] := VarArrayOf(['@InParam2', 'test_param']);
  ClientData.Provider.SetParams(Params);
  ClientData.Open;
end;
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