The "Organimi Charting Your Future" logo in the bottom left is not removable. However, the logo in the top right can be removed from the printout by disabling the checkbox "Include Logo" from the print options (under More Options) at the left.
Or, click Settings on the organization on which you wish to update your logo. (Tip: Click the Organimi logo at the top left of the screen to view your organizations). Then click Organization Profile at the left. Drop the logo onto the tile that states "Drop logo here or click to choose". Click Save.