I have a 2013 Diamondback Podium 3. Is it possible to use it as a touring bike?
This bike is a poor choice for any touring where you have to carry things (if you're doing a supported tour, you may be able to pass with it). It doesn't have rack+fender mounts and doesn't have particularly tough wheels. 

Depending on the type of touring you're doing, you should look at some touring bikes like the Surly Long Haul Trucker or Trek 520.  Typically, these are made of steel (repairable), have lots of rack and fender mounts (so you can carry stuff and not get wet), bar end shifters (simpler and less prone to failure than brifters), a wide range of gearing (so you can tackle hills efficiently), tough wheels (36 spokes typically, so they don't break), good tire clearance (fat tires = more weight carrying ability and nicer ride) and a relaxed geometry (so you're not in pain after a long day of riding).

The bike you choose (and how you modify it) for touring will depend on the type of tour you plan to do. But generally, you need to pack light.