Show Pads with their Name on PCB altium
If you want something to be shown on the silkscreen, you basically have two options:


If you want it to be reusable, add the text to the PCB library item (the underlying footprint). The correct layer is named "Top Overlay". This is typically your silkscreen and it's also the only layer which can be displayed in the 3D view as "silkscreen".
If you want it just for this one project, just add some text to your PCB (again, on the Top Overlay layer)


One more thing: You cannot add that kind of numbering automatically (well, maybe you could with a script, but this will include some work).