After downloading Touchanote and signing in to Evernote on your NFC-enabled smartphone like the Samsung Nexus S, creating tags is simple:
Select a Note
Select a note from your Evernote archive. In the context menu for that note select More, select Share, select Touchanote, then select Write to Tag.
Hold your NFC-enabled phone to an NFC tag. To access your note later hold your phone to the tag again and it will appear on your screen.