How do I show/type to for xyz to be displayed in the relative location bp node like what is shown in the image? same question applies for start location.
just hover over the yellow part of the node, the vector part… right click with mouse and select “Split Struct Pin”… which will break out the vector into its X, Y and Z parts. You can also “Recombine Struct Pin”…
In addition, you can also draw out a yellow line from the vector entry and “Break Vector” which will also give you access to X, Y and Z
You can do Split and Recombine, Make and Break vectors, rotators, scale and transforms** 
**transform == location vector, rotator and scale combined