A detailed explanation you can find in the wiki of Puppy.
Puppy is a very loved Operating System that is good supported with manuals, wiki and forums.
Therefore your choice for beginning with Linux choosing Puppy was excellent.
What you try to find you will find here:
PS: if you have multiple-boot (various OS) you might need an other hint for the grub install
Grubinstaller > to Root of Linuxpartition
Console: dd if=/dev/hdaX of=/tmp/bootsec.lin bs=512 count=1
copy: bootsec.lin from /temp/ to C:/
change C:/boot.ini => : c:\bootsec.lin="Grub > Puppy"
adapt Menue.lst on Linuxpartition at boot/grub/