[Playing with legendary reward]

I got the Samisen and Orik's Shield (scenario B and 1 legendary completed) and the cards are in my collection. But how to play with them ???

I do not see them in my manage deck menu.

[How to «not get a card»]

During a game, when draw a card and I dont want to get it (even if I have 100% chance), is there a way just to ignore the card ?

[Scenario number and objects]

I have an armor of level 3 and I am able to put it in my deck even I am just doing the adventure number 1. Is that normal ? In the physical game, that cannot be possible. A bug ?