Unable to Extract Coordinate Data

I just started using Paraview. I have a dataset with flowfields in .vtu format. I opened them in Paraview and I am facing the following issues:

  1. Most of my functions including filters, and extractors are greyed out and I am unable to use them.
  2. I want to extract the Mach Number at selected coordinates but I am only able to extract in terms of Point ID when I open the spreadsheet view.

Kindly help me with this issue as I am very new to the software.

Press Apply.

want to extract the Mach Number at selected coordinates but I am only able to extract in terms of Point ID when I open the spreadsheet view.

PointDataToCellData

Okay, I converted it to cell data. Now how do I extract coordinates and mach number at those coordinates?