The very first step in the Polkamarkets app.
Step 1: Head to https://app.polkamarkets.com/
Step 2: You need to read and accept the Terms & Conditions and Risk & Disclosure policies in order to proceed.
Step 3: Click the "Connect Metamask" button on the top right corner
Step 4: You might be prompted to change to one of the following networks: Polygon, Moonbeam and Moonriver.
If so, just click on "Change Network" and switch to accept the Metamask prompt to switch networks.
You'll also be prompted with adding the Network (Chain) to your network list if you haven't done so before.
Step 5: All set! You're connected and you're ready to make predictions 🎉