The F2 key is for accessing the bios setup.
In some boot loader menus:
To edit a boot menu entry.
When the boot menu pops up with the selection to boot the Puppy version.
Have the entry you want to edit high lighted.
Before it activates.
Press the e key.
That puts the boot loader, into the edit mode, for that entry.
After making edits to the entry.
Press enter key, to set the changes.
Press b key, to boot now, with that edited entry.
This edit is only good for this boot.
The entry goes back to original on next boot.
To make changes always be there.
You have to open the boot loader .cfg file (that provides the boot loader menu) in a text editor and make changes and save the updated file.
The file could be:
grub.cfg
syslinux.cfg
menu.lst
Note:
Grub2 boot loader may use something other than e key to access edit mode.
It should tell you at bottom of boot menu what keys to press.
Any boot loader should tell you at bottom of boot menu this info.