You can connect through Metamask by click the "Connect Wallet" header button

Go to the lock tab and specify your network and currency. In case your token is not listed on Gamblance, you can still select it putting it’s contract address

Enter the amount of coins and the exact date of unlocking the tokens

Double check the configuration and click in the button "lock", approve the tokens if needed and sign the transaction

When the stipulated date arrives, your coins will be available for claim