I really didn\'t think it would be this difficult. Geany clearly has the ability to create projects, add files to the projects, compile the individual files, but then even a
To build project just open a file of the project, then choose Make in the Build menu (shift+F9).
For executing menu Build and Execute (F5).
If the project does not compile using make (as it usually does on Linux), you will also have to edit properties of the project in the menu Project entry Properties.
If you want details you could also read the manual, it could seems dumb compared to googling, but it looks quite clear to me... Just hit F1 key.