You get the root component first, then you get the child component that you set that up via index number. I.E. I need location of child component #2 so I use the number 2 in the child index of get child component. Here is an image with all the nodes. You can check if you are using the correct child component with an actor to string and then print. You get Actor To String by pulling it out of the Return Value.
You can also pull a Get Socket Location from the Root Component node if that is what you need.