Open EG, pull down the menu, find and click on the appropriate stored proc's or (custom) tasks to read data files or to set missing values. Can't find one that does exactly what you want? Bug the excellent tech support to make one for you. This is why SAS is so wonderful and your teacher seems to be behind the curve if s/he does not show you this great new way of using SAS. 🙂
Seriously, stored proc's generate and submit sas code behind the scene, and you get access to the generated code. It is machine (or macro) generated, so they are not at all like hand-crafted by a skilled coder, but you can at least see how your intentions are translated into some kinds of sas code. Some instructors do recommend using the EG generated code as the starting point of your customization. (Personally, I don't.)