truffle-config.js

var HDWalletProvider = require("truffle-hdwallet-provider");
var privateKeys = ["First Private Key", "Second Private Key"];

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*"
    },
    ropsten: {
      provider: function() {
        return new HDWalletProvider(privateKeys, "Your Infura Link", 0, 2)
      },
      network_id: 3,
      gas: 4000000
    }
  }
};