Hi Dave and welcome to the forums
There are 2 ways of doing this, either to have a shortcut in the system tray or the Quick Launch area (or both, if you wish).
To place a shortcut in the system tray:
Click on 'Tools' and 'Options...'.
Click 'Other' and check (tick) the option 'Place OneNote icon in the notification area of the taskbar'. Click 'OK'.
To place a shortcut in the Quick Launch area, locate the 'Microsoft Office OneNote 2007' shortcut in the start menu, right click on it and select 'Add to Quick Launch'.