VirtualBox Fedora Virtualization Enabled in BIOS

I am working on enabling virtualization in the BIOS for Fedora 35 Linux in VirtualBox so I can create a virtual machine in my virtual machine.
How do you enable virtualization in the BIOS for Fedora 35 virtual machines in Virtual Box?
I know the F1 key can be pressed as the computer is rebooting.

So you want to run a VM inside the VM?

If the “nested” VM is 64bit I think you have to Enable Nested VT-x/AMD-V under the VMs processor settings. If it is 32bit I think it should work without it but it will likely be very slow.

If the GUI doesn’t allow it you can try using vboxmanage (video)
https://www.virtualbox.org/manual/UserManual.html#vboxmanage-list
https://www.virtualbox.org/manual/UserManual.html#vboxmanage-modifyvm