I ended up figuring this out. You can use GetActorLocation as ThompsonN13 suggests. However to get what I was originally looking for, GetWorldLocation(DefaultSceneRoot), you need to make sure you are clicking on the reference item and searching in the window that comes up there. I was just left clicking in empty space and trying to find it there, but you need to drag a branch from the reference item, portal1 in my case, and search within the menu that pops up there.