How to switch network in MetaMask on Polygon
You can switch between different blockchain networks while on Polygon quite easily. This guide will show you how to switch between networks on Polygon using the MetaMask wallet.
Step 2: Connect a wallet you own by entering your password and clicking โ€œUnlockโ€.
Step 3: Approve the Signature Request from Polygon by clicking โ€œSignโ€.
Step 4: You should now be on the Polygon dashboard. Now, click on the MetaMask extension in your browser and select the Pull Down Menu that says โ€œPolygon Mainnetโ€. A selection will appear, with a tick next to the network you are connected to. Currently, this is Polygon.
Step 5: When you need to use Ethereum Mainnet again, just select the โ€œEthereum Mainnetโ€ option to switch to Ethereum. Choosing any other option will connect you to that particular network.
Step 6: And youโ€™re done! When you have connected, the wallet should show โ€œEthereum Mainnetโ€ to confirm that you have just switched to the Ethereum network.
Now you can switch your Metamask wallet between two chains whenever you need it for dapps.

Option 2.

Go to https://cointool.app/other/chainList find a Matic Mainnet and click on "Add to Metamask"

Option 3.

Add Polygon Network in Metamask manually.
  1. 1.
    Open MetaMask and click the network dropdown menu, which is located at the top of the window. This will say โ€œEthereum Mainnetโ€ by default.
2. Click โ€œCustom RPCโ€ and enter the details as seen in the screenshot below. Weโ€™ve also included a plain text version of the details below the screenshot so you can simply copy and paste.
Network Name: Polygon Mainnet
Chain ID: 137
Currency Symbol (optional): MATIC
Block Explorer URL (optional): https://polygonscan.com/โ€‹
3. Click โ€œsaveโ€. Youโ€™re now connected to the Polygon network!
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Option 2.
Option 3.