The following functions are supported:

The top buttons:

New For starting a new game - click here.
Quit When you are ready to give up - use this button.
Hint This button will show you matching card pairs.
Statistics Here you can see the pathetic history of your wasted time.
Settings Brings up a dialog where you can make your settings.
About This help screen is displayed by pressing this button.
Exit For terminating the program. If you have an unfinished game, you'll be prompted for saving.

Navigation:

With these buttons you can go backwards and forwards to fix your mistakes.

Playing the game

To win the game you must remove all the cards in the pyramid to the Goal pile above right.

Here is how you do it:
Hints:
By right-clicking a card you can see where all equal cards and all matching cards are positioned. This will help you with planning your next moves better.

The board below showing removed cards info is very useful, but in the Settings dialog you can select to not have it shown.

Right-clicking the Exit button will show the background without any disturbing buttons and cards. Right-clicking the background will restore the window.

Clicking the score panel will turn on a small win/lose video in that panel. Clicking it again will close it.