Creating a System in System Landscape of EP7.0 connecting to ESS6.0

Could someone explain in detail and hopefully with examples, of the process of creating the System with the alias 'SAP_WebDynpro_XSS' in the System Landscape when implementing ESS.

I am getting an error message of wrong password, and I think it has to do with the fact that I haven't entered this data in correctly.

Thanks,