Most menu and toolbar actions have a keyboard shortcut assigned - instead of clicking through the main menu you can invoke the action by pressing a combination of keys. The assigned shortcuts are visible in the main menu items and also in toolbar buttons tooltips. You can change the keyboard shortcuts and define new ones in Options window under Keymap tab. Click menu Tools - Options to open the Options window.
Keymap tab lists all available actions and their assigned shortcuts. To change a shortcut or define a new one just double-click the appropriate Shortcut column cell and press the desired combinations of keys on your keyboard.
It is recommended to spend a little time memorizing shortcuts to frequently used actions as it will greatly improve your work flow in Expert Lotto.