You need ZIL in order to submit any transaction on the zilliqa blockchain. A wallet is where you hold your ZIL and how you submit transactions/create/buy/sell items on Mintable.
In order to use a dapp (decentralized application) you need to have a wallet that can connect to dapps. Currently that would be Zilpay.
You can get zilPay on as a Chrome or firefox extension. Its super easy to install, it takes about 5 seconds and then about 10 seconds to set up an account.
Get zilpay here: https://zilpay.xyz