First link your WAX wallet in game

on https://wallet.wax.io/dapps your WAX address is located at the top left

once your WAX wallet is paired with your Splinterlands account go here
https://splinterlands.atomichub.io/tools/overview/splinterlands

click deposit to game

make sure your Hive account is the one that's listed to deposit to select your card and click deposit.

WAX Atomic Hub has its own Splinterlands page with the tools that are used above
https://splinterlands.atomichub.io/
Hope this helps congrats on the NFTs every post I do has an airdrop.