Install SQL Report Server on a separate server using remote instance for dbs

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http://serverfault.com – I have been googling a lot to find the installation guide on how to install Reporting Services on a application server, but couldn't find anything. I already have an SQL server on another machine and want to use this server to host the reporting databases. On my own application server, where I am trying to install Reporting Services, I am not quit sure what to choose/configure for Instance ID and Instance Root Directory which is the page that comes right after the Feature Selection in the SQL Server 2008 R2 Installation wizard. So how to I proceed with this? (HowTos)