It's worth mentioning that the competition logo isn't utilized in all graphic themes. In certain themes, only the name of the competition is incorporated. When initially creating a competition, you have the option to include the appropriate competition logo, which will be displayed on your templates.
When the competition logo is used, it will usually be seen in full-screen graphics like the Intro graphic and match ID graphic, however, you should check each graphic theme for the exact placement and if the competition logo or just the competition name is being used.
See the image below for an example of how the competition logo is used in one of the graphics in the Rigel theme.