Which are the faucets?
A Bitcoin faucet is a website that offer its users small amounts of Bitcoins for doing nothing. Normally you have to enter your Bitcoin address and a captcha(to prevent bots) and get paid. Faucets are usually sponsored by advertisements but these ads only work to keep the faucet alive and cover the costs.
How do I participate in this faucet?
To participate in this Bitcoin faucet you need a Bitcoin wallet. You can get a Bitcoin wallet for free by installing the open-source Bitcoin software from the official website. Alternatively, you can use a web based wallet like Coinbase or Blockchain to get an address. No registration is required. Copy/paste your payment address to start using.
How much can I claim?
You can earn, depending on who gains obtained the owner of the faucet you claim free reward and you can claim free reward every 800 minutes. So you can calculate your average earnings.