How do I display the console on counter strike GO
You have to go to the Game settings and check the enable developer console. After this you can use ` or the assigned key to open and close it.
Source: http://fearless-assassins.com/tutorials/article/268-csgo-how-to-enable-console/
Start game -> Help & Options -> Game Settings -> make sure you have this enabled(There is an image in the source link for the page you are looking for)
Then You can go to Help & Options -> Keyboard/mouse -> and change your console key. The default is " ` "(Tilde Key).
Hopefully this helps.