Hi Srinithi,
For simulation procedure of Ract Race Hybrid in HFSS you may refer HFSS Full Book, It can be got by googling or just refer the link https://www.edaboard.com/threads/130142/. It would give you step by step design procedure.
For simulating in ADS you may look at example provided in example directry C:\ADS2009U1\examples\Momentum\Microwave\Rat_Race_prj (assuming ADS has been installed in default directory)
Hope this helps...