I am using the lastest version of Fedora in a Virtual Box. Once, I press "e" during the boot process, I do not see any line where I can append 3 to boot in non-graphical mode.
Can someone help me out?
Make sure your keyboard is being captured by VirtualBox; does it work at all?
Can you navigate up and down to pick different kernels? IF so thats fine, I am misunderstanding whether you can edit at all.
Once you get in you have to edit aline that has root=... for the kernel you are choosing. On a redhat/fedora type system, that should be a line that starts with
linux16 /boot/vmlinuz-....... This line will be followed by a line that starts with initrd16 ...
(Depending on distro and version it might be linux or initrd, not linux16 or initrd16