Sister, I wrote a review of this game and did not mentioned the process of how to save, my bad. Here is a detailed route to saving copied from Mag's walkthrough on this site, hope it helps.
"The main menu is accessed by using the ESC key. The main menu has play, load, save, options, credits and exit selection.
The options menu has selections for language (my game has English only); volume for voice, music and sfx, lateral inventory and subtitles. The resolution, antialiasing and graphics quality have several selections also.
The save feature is accessed by double left clicking on a blank square until the frame darkens or changes color and then wait until it automatically goes back to the gameplay. The saves can be overwritten. There are scroll arrows on the right side of the squares. There are 30 saved game frames."