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After successfully installing the MetaMask Wallet extension, refer to this tutorial to add the Moonriver Network/Moonbeam Network/ Astar Network
Step 1: after successfully installing MetaMask, click the avatar logo and settings in the upper right corner to enter the network configuration interface.
Step 2: enter the Networks tab and click the "Add Network" button.
You can enter the following parameters in the corresponding box of the network configuration:
An easier way is to enter the MetaMask wallet, click on the network at the top (such as: Ethereum Mainnet), then click "Custom RPC", and enter the above parameters to complete the network configuration.
Similarly, you can fill in the following parameters to add Moonbeam and Astar networks to the MetaMask extension.