Assigning values to RFID tag

Hi

I'm wondering how do I assign specific values to a basic RFID tag? I'm doing a project where the tags need to correspond to common grocery items. In turn these values will be a reflection on how environmentally friendly or unfriendly the items are.

Thanks in advance for any help.
K

I'm wondering how do I assign specific values to a basic RFID tag?

That's done using an RFID writer. You got one of them, right?

I'm doing a project where the tags need to correspond to common grocery items.

How many different tags do you have? Usually, they come pre-written, and you just read the code on the tag, and do something based on the code you read.