Publish the module

After install go to Content → Site Modules (or System → Site Modules) and open Sticky Notification (or create a new module of that type).

• Set Show Title to Hide
• Choose any existing template Position (debug, footer, or similar is fine — the toast portals to body)
• Set Status to Published
• Assign Menu Assignment as needed

You can publish several Sticky Notification modules on the same site; enable Queue so they stack instead of overlapping.