To enter the passwords you need to go to the "EXTRAS" and select the respective option.

Effect	Password
Unlock Avery Rarecard	iz7kP3v4U
Unlock Caleb Stonewall	yhJpfkSQJ
Unlock Corvus Cardson	DvS1nLdKn
Unlock Damon Valiant	lpfITZI3A
Unlock Esau Taric	PJPkEhMnV
Unlock Everard Valiant	WVJuU6OVr
Unlock Flam Berg	iOviw3bTQ
Unlock Fletch Blitzen	GVxM7GiYi
Unlock Grandpa Danger	dsIHHKCBo
Unlock Jack Wallside	f3wBfGa3x
Unlock Jude Sharp	fej5E4gFw
Unlock Lawrence Leepson	SqvSSePMY
Unlock Nathan Swift	Ph9pYDwpQ
Unlock Shawn Froste	nOWVoA0qz
Unlock Shortcake Holmes	Cu6H4N3AD
Unlock Spot Barkley	e7ao8hLCb