pkhex help

[bestdisplayname]

no idea how to use this forum and even if im asking in the right place. 
there is there any way to undo this option ? 

[Kaphotics]

Restore a backup. PKHeX automatically saves a backup of every save file you load into the program.

[bestdisplayname]

13 hours ago, Kaphotics said:

Restore a backup. PKHeX automatically saves a backup of every save file you load into the program.

where, I did not found it