Welcome to the forum @rcdawson
Need clarification of situation.
How? If you installed the .msi from the main Download page, you installed the TrayIcon.
How To Bypass Duplicati Login Password has a video following some textual explanation.
If you installed something else (Other versions choice), please clarify how you installed.
How? Most ways (Start menu, Desktop shortcut, autostart at user login) will start Tray Icon.
You can also start Task Manager and see exactly what Duplicati process you have running.