can i add google ads on my free blogspot based blog if yes then how?

[Se0tools]

can i add google (http://www.google.com) ads on my free blogspot based blog, or are there any charges or registration fees to setup that? my blog has 500 visits every , how do i make money out of it???let me know

[serversea]

Google ads are shown on a web by pasting their code for a specific account. So, if you have access to paste a code, you can use them to make money.