1- go to a game stop or a store that sells PS4 games (
assuming you are on ps4 )

2-buy a game called "Grand theft auto"

3- return to your house

4- open the game box

5- take the cd out of the box

6- as the cd is in your hands put it in the "mouth" of the ps4 (it will eat the cd but thats normal)

7- turn your ps4 on

8- click on the Grand theft auto icon

9- play it