this one
That's the exe file, not the shortcut. Typically people have a shortcut on their desktop that they use to start Bitcoin Core. That is what should be edited.
Anyways, since apparently that is too hard for you to do, in the same folder you are in right now, deselect everything (click in the big empty white area under those files) and then hold Shift and right click. You should see an option that says "Open command window here". Click that. Then type
bitcoin-qt.exe -choosedatadir
and hit enter. This will start Bitcoin Core. You should see a dialog box appear that asks you to choose the datadir. Choose it and continue. Now, everytime you start Bitcoin Core, it will use whatever datadir you set in that dialog.