Use Dislin

No.  Do it the other way round. 
Add your source code to the empty project example.

When you create an empty project, SF will make you save the project.
As soon as you have done so,
- pull down the options menu,
- select "Project...",
- Change "Program.exe" to your program-name.exe,
- Tick Windows GUI (no console) if you are using Dislin for Windows I/O (NB see note below),
- Click "OK",
- Press Ctrl-Shift-S on the keyboard,
- Right-click your program name in the project outline,
- Select "Add files...",
- Add all your source files, and
- Press Ctrl-Shift-S on the keyboard (again).

If you are unsure what the Windows GUI (no console) tick-box does, try without this then try with it, and you'll see,
TIP: leave it un-ticked during debugging, then tick it before compiling/building the final version of your executable.
Leaving it un-ticked enables you to see any system or compiler runtime error messages, as well as the output of any WRITE statements you might decide to can insert temporarily in the code.
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John