More than 60 cards?

Hi Guys,
I'm very new to this and I've attempted to add my deck into the game, however the issue I have is that my deck contains 65 cards, however the game is only adding basic land cards in up to 60 cards, is there a way I can have it add more?
I'm very new to this and I've attempted to add my deck into the game, however the issue I have is that my deck contains 65 cards, however the game is only adding basic land cards in up to 60 cards, is there a way I can have it add more?