How do I direct my navigraph pln from my email cloud to my FMS in msfs 2020
If you mean saving plans from Charts Cloud, they are initially saved into your Downloads folder. You may need to change settings in your browser to prompt you for where to download these.
When you first export your .pln from Charts , navigate to and choose your MSFS LocalState directory where there should be other .pln plans.
Depending on how you obtained MSFS, this will likely be something like
Sim from Marketplace:
Sim from Steam:
%appData%\Microsoft Flight Simulator
This directory should now be remembered for subsequent Charts exports.