From your Squad Dashboard, click the 3 lines icon in the top left corner for the menu to pop out. You will then click on 'Pods' from the list on the left.
You will then see all the Pod's(Groups/Departments) in your Squad(Organization), click on the pod you want. Here's an example of what a pod looks like from the list.
You will then be brought to the 'Discussions' of that pod. From the menu on the top of the page, click on 'Settings'.
From here, you will see Pod specific settings, like the ones shown below. At the very bottom of the page, click on 'Delete this Pod'. You can alternatively set the pod as default or required, if you're an 'admin'.
*For more info on Roles and Permissions, click here.