Using Rails on MAMP via Passenger?

I'm new Ruby as well as the Rails Framework. I want to install
Passenger so that I can develop in MAMP (Leopard), but I can't find
any instructions specific to installing Passenger on MAMP.

Can anyone provide with me instructions on how to do so?

Why do you want to develop using Passenger ? Just use mongrel locally
and use passenger on your production box.

Use the built-in Mongel server. In the terminal go to the directory of
your new rails app and run "script/server"