Which survey card do you have? Please be specific. Several different companies made multiple survey cards for the HP 48GX.
In general, press right-shift 2 (LIBRARY) to see all your currently installed libraries' top menus. What to do after that is detailed in your card's owner's manual. Using the card without its manual and keyboard overlay would be an exercise in futility.
Disclaimer: I don't work for HP. I'm just another happy HP calculator user.