Tokens (including NFTs) minted on the Tezos blockchain can be sent outside Sweet, to your own address, managed by a wallet such as Kukai.
Disclaimer: Once a token is sent outside Sweet, we call the contract to revoke our control over it. The fate of the token is solely in your hands once it leaves our ecosystem.
Navigate to the official Kukai Wallet website (https://wallet.kukai.app/)
Click Create Wallet
Write down your seed phrase (very important!) and click Next
Download your encrypted keystore file. Some people advocate deleting any digital copies of your keys; and only keeping the seed phrase on a piece of paper, so as to make things more difficult for an attacker.
Click Open Wallet
Copy your account address (this is the hash of the public key)
Navigate to sweet.io in a web browser in desktop mode
Click "LOG IN / SIGN UP" and log in
Navigate to My Wallet
Click on a token you would like to send to your own address
Click the three dots on the upper right of the token details (above the rarity) and choose Send to Private Address
Read the warning of potential issues that could occur and click I Understand
Paste your Kukai Wallet address > wait for verification > and click Confirm Transfer
Note: Transfers usually finish within 5 minutes.