If you have not yet registered, you must do so before you can download data.
Registration is free and only needs to be accomplished once.
After registering, you just use your email address to log on. Select your state. You may either click on the map or choose from the pull-down state picker. Decide if you want to download data of several kinds for a single county, or data of a single type for several counties. Choose either the county or the data type desired.