The answer to 'how to install electrical meter' is to hire a licensed electrician to properly install a new electrical meter. Electrical meters measure the amount of electricity used in a home and are required by utility companies. Attempting to install an electrical meter yourself can be extremely dangerous and is not recommended for most homeowners.
A licensed electrician will be able to safely disconnect your home's power, install the new meter, and reconnect the power while ensuring everything is up to code. They will also be able to handle any necessary paperwork or coordination with your utility company.