If you haven't added the Polygon network. When you first connect your wallet to the site, you can add Polygon network settings automatically. Below are screenshots of how this happens on mobile devices.
After adding settings and connecting, you can make a purchase.
Polygon network settings manually
For minting zombies (REZ) you need to choose the Polygon net. If Polygon is not in the list, then you need to add it. We go into the already installed wallet and perform the following actions:
Congratulations on the successful addition of the Polygon network to your wallet! You can mint zombies on the official website: https://rezombies.com/#buy and directly from the contract.
When minting zombies directly from the contract, you must take into account that one element will require a gas limit: 280,000. if you mint, for example, 5 NFTs, then the gas limit must be multiplied by 5.
After purchasing MATIC, you need to send it to your MetaMask wallet. In the event that you have another cryptocurrency and tokens, you can use the bridge: