Currency arbitrage query from varasity

The USD INR Pair (Part 2) I started reading this module. In the first part of the module it explains about the arbitrage in USDINR pair. It mentions that if spot is less than futures then arbitrage is possible. What exactly is spot price here? All contracts traded are F&O so where is the underlying? It also mentions go long in underlying then short futures. What exactly is this underlying and where can I trade it ?

You can ignore spot in this case as spot for currencies is not traded on regular exchanges. You can relate it to equities.

Extract from the same chapter -

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My bad. Must have skipped this by mistake.

Says not accessible to retail. Who can access it and how ?