You do not need to have a Google account to use this service and the code to insert into your website is generated for you.
- Go to www.google.com/fonts
- Browse through the various fonts which can be filtered by category
- When you have found a suitable font click the Quick-Use button (first button on bottom-right)
- Select the character styles that you would like to use then copy the code at the bottom of the page and insert it in your website’s style sheet
- You can now use the chosen font-family like any other font installed on your computer
If you are using SSL on your website the link below shows you how to modify the code in your styesheet so that Google Fonts still work:
How to use Google Fonts under both SSL and non-SSL without SSL insecure messages