So I'm just gonna post this here so when i have to tell someone how to do it you'll know how to do it:

Step 0: Import the image from your website with the list laid out 10 cards across and 6 cards down. There should be an option on .dev or .io.

Step 1: Open the simulator

Step 2: In this order at the top: Objects > Components > Cards > Deck

Step 2a: upload face is the front of the card. Note: Save on cloud, not local (Others won't be able to see your card). Back is where you can use custom sleeves or leave as is.

Step 3: click that and make the deck you will see a screen. Here are the settings width 10, height 6, number (refers to cards if you want to put more than 55 in there) 55. Don't mess with anything else. Now you can click the import button and wait a second.

Step 4: make sure entire deck is selected and size it up (press + button) until it fits the slots.

Step 5: Save this set up for future decks! Use Save Object.

if you need a button guide i got that too.