It looks like DF Robot has two very similar shields and their 'Manual' seems to be a bit confusing. Your pinout diagram is shown in the manual but the photo directly above that pinout shows a slightly different shield.
If you have the one in the photo then you should be able to access the analog pins using the holes in the lower right corner. If you have the one in the drawing then you may have to solder to the pins coming up from the Arduino.
In any case stay away from the LCD4bit library. If you want to know why then just unzip it and read the comments.
Don