Index funds like the ones discussed here can be bought through a broker. You'll need a brokerage account or a retirement account to purchase these funds. Opening one of these accounts is similar to the process of opening a bank account. Once you have your account, find the fund you want to buy, and place a buy order. Keep in mind that not all brokerages offer the same funds, so if you have a specific one in mind, then you'll want to be sure you open an account with a brokerage that offers access to that fund.