Part of your foreskin is tight, a tight band all the way around which presses on your glans (penis head).
part, and only
that tight part, is where you apply the ointment (or cream, if that is what you have). To find the tight part, you pull your foreskin back as far as it will go; if it will not come back over the head, then the part that will not come back over the head is
the tight part, and that is the part to which you apply the medication whilst you are pulling the foreskin back, nowhere else. You do not want your glans to shrink, so you do not
get any of the medication on it.
If your foreskin does
pull back completely, but the tight part "narrows" your penis where it is pulled back, then you put the medication on that narrow part, make sure there is no excess that is going to wipe off onto any other part, then pull your foreskin forward again. You do not
put the medication on when you are doing the stretching, because doing the stretching will tend to spread the medication onto parts that you do not want it on.
The translation matter is a little complex. The word in French is "glans
"; it is exactly the same
as in English because it is not
an English word, nor is it a French one either, but is Latin and means "acorn" - and that is what it looks like. But it is apparently related
to the French word "gland".