You need to know what specific values you need to save to make a save game (Player's health? Location on screen? Level number? Apple pies collected?), then set the File of the INI object to "./[filenamegoeshere.ini]" at the start of the frame. When you need to save, repeatedly do these:
Set item of INI to "[Item name]"
Set item value of INI to [Item value]"
until all the values are saved. To load, you need to repeatedly set the item and set a counter or value in your game to the value of that item.
Using an INI extension or MMF makes things a bit easier, as the switching of items/loading are combined in one event.