To find your NFT ID, you should claim your NFT assets to your wallet first. After that, you can find your NFT ID at blockchain explorer such as bscscan.com, Here is a step-by-step guide.
Step1. Open the www.bscscan.com at your browser, and paste your wallet address to the search bar.
Step2. Click the token amount to pull out the Drop-down menu,
Step3. Scroll downthe menu, you will find a ERC-721 token named as SuperStep Sneaker, then click on it
Step4. Click Inventory, you will find your sneaker ID.
Step5. Open Metamask, select [NFTs] and click [Import NFTs], enter the sneaker contract address and NFT ID (you can find the imformation in Step3), click [import].