To access CNFT.IO on mobile you need a wallet that supports Smart Contracts on mobile. Currently, the only wallet that supports this is Eternl wallet. The Eternl Wallet app can be found on both IOS and Andriod.
Make sure you confirm you're downloading the correct app as there are scam apps that will steal your information.
Once you have downloaded the Eternl app, scroll down until you see CNFT.IO.
Click the wallet icon in the top right and sign in to your wallet.
After you're signed in you can access all your assets and interact with CNFT.IO from your mobile.