to mint , Use Shelly-era cardano wallet and Send Exactly the amount of ada corresponding to number of nfts you want to buy :

 1 NFT => 14 ADA
2 NFT => 28 ADA
3 NFT => 42 ADA
4 NFT => 56 ADA
5 NFT => 70 ADA

Mint address             addr1vy0fz3u868srahe4fgtuwjx08tqjagnkzwn9n2v4fyfhvuch36t8d