OK,...first of all you'll need to buy bitcoin,...among the many places to buy are localbitcoins.com, once you have bought bitcoin look for a cryptocurrency exchange to send bitcoin to & exchange it for Ripple,..a good guid is coinmarketcap,.. Rpple,..press on the Markets tab & pic an exchange,..Cryptopia or Poleinex are good ones whoever they don't all supply Ripple,...belloe is a list of all ripple suplying exchanges,.....https://coinmarketcap.com/currencies/ripple/#markets,...Good luck,..also is there any specific reason your bying ripple?,..i would like to know,..thankyou