In the version of the program you are using, LiveUpdate should run automatically when first installed, and then once a month after that when you run SignBlazer from any of the shortcuts created by the setup program.
Currently for your version if you want to manually run LiveUpdate more often, first delete the shortcut you created yourself, create a new desktop shortcut by running Windows Explorer and navigate to the folder where you installed SignBlazer, hold down the right mouse button and click on the "SignBlazer LiveUpdate.exe" file and drag to the desktop and release the mouse button. Select "Create Shortcut here" from the menu that appears.