You can enter an existing BIP39 mnemonic, or generate a new random one. Typing your own twelve words will probably not work how you expect, since the words require a particular structure (the last word is a checksum).
For more info, please see <HOW TO USE RECOVERY>
CAUTION: The procedure link below should be done on a local procedure…
To get started <DEPRESS TO RECOVER>
To get started recovering a QR Code <DEPRESS TO RECOVER QR>
To start a fresh Wampum Wallet from Paper or PVC, click to obtain instructions <INSTRUCTIONS>
PS: For more info on Mnemonic(s), please see the BIP39 spec.