So when I installed the pod file into my project I forgot to add in FirebaseDatabase and now I want to add it in how do I do that? Will going through the pod init process again mess things up?
Photo Of My Pod File:

You Should just add the new pod you want, and run:
pod install
And it would work, and won`t mess up you code.
Iy will Update (If necessary) Older Pods, and Install New Ones. You should not Run pod init, just pod install.
来源:https://stackoverflow.com/questions/41960382/adding-edit-a-pod-file-after-initial-init-firebase