You do not need to register if you just want to ask or answer a question. You do need to register if you want to earn reputation which lets you vote, retag, and edit.

To register for SnippetGood.com, click the login link at the top of the page. Rather than storing users and passwords ourselves, SnippetGood.com integrates with OpenID accounts. Basically this is a new "login once, go to any site" technology. If you already have one (it will look like a web address starting with http:// your-username.your-provider.com /), then enter it into the text box on the login page (including the http://) and click the Login button. If you don't have one (or think you don't have one), keep reading...

Any website can become an OpenID provider. Many, like Google, Facebook, and Yahoo! already are. If you don't have any of those, you can get a new OpenID by following this procedure:

• Go to https://www.myopenid.com/signup
• Make up a user name Put in a password
• Enter any email address you want to use
• Enter the text in the captcha
• Check the I Agree to... checkbox
• Click Sign Up

That should give you an OpenID and it will look like a website address (http://...myopenid.com). You can use that on any OpenID site including SnippetGood.com.

Sources:
http://moms4mom.com/questions/6/how-do-i-log-in-with-an-openid
http://stopthesearch.com/questions/4/how-do-i-log-in-with-an-openid