Main buttons

Each setting page or setting has following buttons:

Apply - Pressing the button you enforce all the changes you made, but if you close the program without pressing "Save" button, you lose all the made changes.
Save - Pressing the button you enforce and save all the made changes. Setting form will be closed.
Restore - If you press the button, all the made changes will be discarded. All the old settings (the settings which were set before you opened "Settings" form) will be restored.