1. How do you trade in EURUSD in India?

This is an interesting question.

Many individuals wish to trade in overseas forex trading platforms. But, this is not possible in India, at least, as of now.

In India, transfer of money for purpose of overseas foreign exchange trading through electronic/internet trading portals is not permitted under the Foreign Exchange Management Act (FEMA), 1999.

RBI Advisory on Overseas Forex Trading through Electronic / Internet Trading Portals
https://www.rbi.org.in/Scripts/BS_PressReleaseDisplay.aspx?prid=23941

So, to take an exposure in pair like EURUSD, one can trade in cross-currency EURUSD futures in India.

Currency Derivatives Segment of NSE
https://www.nseindia.com/live_market/dynaContent/live_watch/curr_der_stock_watch.htm