You can use either Ancestry.com (USA) or Ancestry.co.uk (UK and Ireland). Other versions of the site may be offering the same opportunity to explore the Irish records in the database; I don't know for sure because Ancestry's (**!&*?!**) geo locator stops my computer viewing the home pages. If you don't already have an account, you can register for a free one by providing your email and password. A user name is sent to you, and you can then search the records. It's a quick, automated process and you don't have to provide any financial details.
Access to the records in the featured collection will end at 11:59pm ET or GMT, depending on which site you're using.