1) Go to https://datapolis.city/trade
2) Connect your Wallet to the Dapp. Make sure you are connected to the correct network.
3) Click on "You are selling" dropdown and Select OCEAN token from tokens Modal
4) Click on "You are buying" dropdown and Select Datatoken you want to purchase (or swap to)
5) Enter OCEAN amount you want to sell/swap for Datatoken. Click on 'Swap' button.
6) Check the displayed values (especially 'Minimum Received' and 'Slippage Tolerance'). Once done, click on 'Confirm Swap'
7) Confirm transaction on your selected Wallet (e.g. Metamask).
8) Once transactions are processed, you can click on "View on explorer" to view the confirmed transactions on relevant explorer for that network (e.g. Etherscan)
That's it You have now successfully swapped OCEAN to Datatoken of your choice.