Hello Dan,
I assume that you are working on Windows Forms. You may follow the below
steps to set a form which looks like a splash form:
1) Open "Properties Window" from "View" menu option.
2) Click onto your form title and select it,
3) Set "FormBorderStyle" property to "None"
4) Set "Locked" property to "True"
5) Set "StartPosition" property to "CenterScreen"
6) Set "WindowState" property to "Normal"
7) Set "ControlBox" property to "False"
8) Set "ShowInTaskbar" property to "False"

Then, put a "PictureBox" control onto your form and set its properties as
below:
1) Set "BorderStyle" to "None"
2) Set "Image" property to choose your image to display
3) Set "SizeMode" property to "StretchImage"
4) Set "Visible" to "True"
5) Set "Dock" property to "Fill".

This settings will only show your image, there will be no visible border or
part of your Windows Form.
If you wish to close this Splash screen after a while, you may put a
"Windows.Forms.Timer" control. Set its properties as below:
1) "Enabled" to "True"
2) "Interval" to "3000" (Runs in every 3 seconds)
3) And write your code into the method of timer as below:
  void timer_SplashClose_Tick(System::Object *sender, System::EventArgs *e)
  {
      //This method will close your form after 3 seconds when form is loaded.
      this->Close();
  }