First, connect your wallet to GameStop NFT, and add some funds in ETH, the native cryptocurrency of the Ethereum blockchain.
Once you've added ETH to your Layer 2 account, open the profile menu, and click the Activate Layer 2 button.
This will open a dialog confirming the one-time fee to activate your Loopring Layer 2 account. Confirm the activation, and approve the transaction in your wallet.
Visit the Explore page. Browse the NFTs, and select one you want to buy. If it has multiple editions available for sale, you can choose from the available editions, and buy the one you like the most.
Once the purchase is confirmed, your new NFT will be added to your profile page.