Back up. Close Access. Open your database. The first thing you see is
most likely the database window, which lists "Objects" on the left side, and
the names of the objects on the right. (If you don't see it, press F11.)
Click Forms on the left, click your form to select it, then click Design.
There are other options for going to design view, so use another way if you
prefer.
The form shoud be open in design view. Click View >> Properties. This
opens what is known as the Property Sheet. The Property Sheet should say
"Form" at the very top. If it does not, click the square at the top left
where the vertical and horizontal rulers meet. This square has a smaller
dark square inside it.
Now try clicking the Events tab.
When you are looking at properties, check the title bar at the top of the
Property Sheet to be sure you are looking at the correct properties.
BTW, Before Update, After Update, etc. are Events. Fields are where the
data are stored in tables. There is some information about terminology and
so forth here:
http://allenbrowne.com/tips.html
In particular, look at the Tips for Casual Users. There is a lot of good
information there.