How do you play video games on your tv if you cant use input

A TV without an input is a box that shows static.
If you mean only an arial input, then you'll need a new TV.
If you mean because the input is currently in use by another appliance then you can either unplug the other input or use a splitter. Radio Shack sells a small box called a RF MODULATOR that will convert video from your game box to a radio frequency (tv channel) that can be plugged into the antenna connector on your tv set. Just plug in all the cables and switch the tv channel selector to the correct channel.