How can I make a bootable USB stick with FreeBSD on it and then boot the image from Plop Linux? (I am using Linux mint) I want to install this OS ,also I want to know if Plop will detect the the BSD image.
Can you explain what you mean by a USB stick with FreeBSD on it. Do you mean a FreeBSD installer or do you mean a Live FreeBSD version ?
If you want a FreeBSD install download a memstick.img version from here.
If you want a Live FreeBSD version download a image from here.
After downloading dump the image to your USB stick with the
dd if=~/freebsd-memstick.img of=/dev/usb bs=1M
usb can be also
/dev/sdc... Check first which drive letter your USB stick will have, otherwise you can delete a wrong drive.