Congratulations! You have successfully set up MetaMask.io in your browser, saved your Seed Words in a safe and private place, set up and saved Polygon as an additional Network, and have Minted your first domain! You can Manage your domain via your My Domains section at UnstoppableDomains.com, for free. And use the Polygon Network on MetaMask whenever you need to - just select the Polygon option from the drop-down Network menu. But remember to select Ethereum again when you need to.