Luno is a Bitcoin and ethereum exchange based in Singapore. If you can get past understanding how to use Gemini it is a unique exchange. After your verification is completed, on your dashboard you will see 2 dialogue box one to buy bitcoin and another for selling bitcoin at the current rate. Recently, the Bitcoin exchange Kraken purchased Cryptowatch in order to improve its own internal trading charts and interface. There are many different ways to buy, but in most cases you need to buy bitcoins or ether and then convert it into XRP. Binance has the most liquidity of any exchange. So now you need to wait for the intimation or status to change from unverified to verified to buy and sell bitcoin.