Playing as Zombie in GW2

Go to the customization  booth or find the "Join uz" station " at customization booth look at the top right of the screen it should say push "whatever button" to switch Teams. 

There's actually multiple ways...

- Near the garage is a booth set up to join the zombies.

- In the Customization booth there is an option to switch teams.

- Entering into a multiplayer match allows you to switch teams if there is space.

- I believe respawning may give you the option as well.

The zombie side is pretty much the same layout as the plants side, so the locations are in the same place.