Oamo data pools are currently built on Polygon and require you to switch your wallet to the Polygon network to participate in data pools.

To get started, head to the homepage of your wallet, click on the network selector in the top left, and then on 'Add network'.

From here, you should see a list of popular networks ready to add (unless you've added the network already). Tap 'Add' next to Polygon Mainnet to start the process, and follow the prompts.

For more information, you can follow Metamask's guide here.