I have charter high speed internet. How can I change it to wireless on my own and keep charter.?

You need to buy a router to go wireless and a wireless adptor if you computer doesn’t have a wireless modem in it. You plug your moden for Charter Highspeed into the Router and connect the router to your computer to Configure it for you computer(s) and then you are set to go wireless.

Charter High-Speed Internet (3)