Doing what you're intending is just what the Pod is designed to do. Just plug your bass into the Pod input and plug a lead from the Pod output into your amp.
You don't say what type of Pod XT it is, whether it's one of the bean shaped ones, the XT live floor pedal or the XT pro rack mount one. Depnding on the type it is, it will have a different way of selecting between a signal that will drive an amp just by plugging it into the amp input, or if you want to get it to pump out a bigger signal (line level) to drive a poweramp directly, so you'll want to set it for "amp" output so that it doesn't overdrive the input of your amp.
Rickenbacker 4001 > Bass Pod XT Live > ART Pro Channel> Crown XLS1000 > Barefaced Big One