hi,
in image_1 I don't understand what kind of changes you want please explain it in more.
and in image_2 you have to
use a blank child theme in your website folder goto
website folder>>wp-content folder>>themes folder>>wplms folder>>course folder
there are many files on which you can make changes according to your need but here you are making changes on only single course page so goto>>single
this is for just checking but now the creating part of the
blank child theme
goto>>website folder>>wp-content folder>>themes folder>>create a new folder name it something like
that
then create a course folder as present in your theme and then create files on that.
filename should be the same as in your parent theme.
note: if you don't have the technical knowledge then you can hire a developer.