Hi,
You need connected a NFC reader with your system and read the tag via the reader, you may use a NFC front end chip as the reader solution, please kindly refer to the following links for details.
NFC Frontend Solutions|NXP
To develop the tag reader Apps, we provide NFC reader library for your reference, please kindly refer to NFC Reader Library|NXP for more details.
If you build your system based on Android, you may install the NXP Taginfo Apps to get the contents from the tags. You may download this Apps from the Google Play store.
Hope that helps,
Best regards,
Kan