If SmartPropoPlus is not already started then start it. You should see a large window similar to this:
At this point SmartPropoPlus is usually already functional. Move your transmitter sticks and see how the Green bars (Transmitter Channels) and Red bars (Joystick axes) follow your movements.
If you can’t see it, then it is probably minimized to the notification area (a.k.a. system tray):
Click once on the icon to display SmartPropoPlus console. If SmartPropoPlus is not functional yet - the start configuration.