The answer to 'how to install electrical meter' is to hire a licensed electrician to properly install the electrical meter. Electrical meters are an important part of your home's electrical system, and their installation requires specialized knowledge and skills. Attempting to install an electrical meter yourself can be extremely dangerous and is not recommended.
A licensed electrician will ensure the meter is installed correctly and up to local electrical code standards. They will connect the meter to your home's electrical panel, test it to ensure it's working properly, and complete any necessary paperwork or permits with your utility company.