The main work (and fun) of making cards games is making the individual cards.
To access the cards list click on Home on the top menu and then the big View All Cards button or go to Admin->More Admin-> Cards List.
Clicking on a card opens up the card edit pane. There you can edit its properties. Every field has description that explains its purpose, make sure to read it.
Adding Keywords
Keywords are added on the custom properties section of the card. Read an example such as (Rhinoceros) [https://dulst.com/animalkingdom/cards/7754495/Rhinoceros\]