Combat Kanga NFT's are being sold as IOU tokens on the XRPL (XRP Ledger), as soon as you own a token you can pre-mint it and find out what Kanga NFT you have got!
Before you can buy tokens on the XRPL you need to establish a trusted relationship between the issuer of the token (In this case Combat Kanga) and your wallet.
If you have a Xumm wallet you can set up your trust line here.
However, if you do not use the Xumm wallet our trust line details are as follows
|xKangaMK1 Trust line|