- Select the Start button and scroll to find Signal.
- Right-click Signal, select More, and then select Open file location. This opens a file folder window for the location where the shortcut of Signal is saved.
- With the file location open, press the Windows logo key + R, type
shell:startup
, then select OK. This opens the Startup folder. You now have 2 folder windows open: "Programs" and "Startup". - Copy and paste the Signal shortcut from the "Programs" file folder window to the "Startup" folder by right-clicking on Signal shortcut, Copy, go to Startup folder, right-click, Paste Shortcut.
- In the "Startup" folder right-click on the Signal shortcut and select Properties.
- In the "Signal Properties" window click in the Target text box. Be careful not to add any characters yet. Use the keyboard cursor keys to go to the end of the text string. Your cursor should now be sitting at the end of "Signal.exe".
- Add a space, then the following parameter by typing:
--start-in-tray
- If you want Signal to use a specific, add a space and then a parameter like:
--lang=en-US
or--lang=nb-NO
- Click OK to save.
- Close all the folder windows.
- Right click an empty part of the taskbar.
- Click Taskbar settings.
- Now in the "Settings window", scroll down to "Notification area" and click Select which icons appear on the taskbar.
- Scroll down to you see Signal and toggle on the switch to the right.
Source: https://www.reddit.com/r/signal/comments/l9ef1e/how_to_add_signal_to_run_automatically_at_startup/