Have you done the pairing of your Splash Drone 3 to its remote control correctly? In order to have a good flight, right syncing or pairing of the Splash Drone 3 to its remote control is very much important. It is one of the most important things to do first- to have it paired correctly so you will have control over your Splash Drone 3. Here's a tutorial for the correct pairing of the remote control.
For more manuals, you can download them from here.