You are done unless it fails to launch the console. This key is usually to the left of the “1” key. Once your console has been enabled, launch it by pressing “~” (tilde button).Click on the “Enable Developer Console” arrows to say Yes.
You must enable the feature first before you can use it. To use the mouse wheel to jump in CS:GO, the command console is your friend. Using the Command Console to Jump with the Mouse Wheel in CS:GO