Uniswap – What Is the Uniswap Version 3 Factory Address?

Change you LP token name in file located at

/src/pages/RemoveLiquidity/index.ts

search for domain object:

const domain = {
      name: 'Spooky LP', // <= here place your LP token smart contract name
      version: '1',
      chainId,
      verifyingContract: pair.liquidityToken.address,
    }

The Uniswap V2 router address is '0x7a250d5630B4cF539739dF2C5dAcb4c659F2488D' for all networks.

In the official documentation you can also find the interface to use the Router.