If options are "greyed" in EasyBCD it means they are unavailable, and that generally implies that you are running a UEFI PC.
Microsoft (not Neosmart) have decided that many boot features available on a BIOS/MBR PC will not be allowed with W10 on a UEFI/GPT machine and have coded those restrictions into the .efi version of bootmgr.
EasyBCD cannot circumvent those restrictions in bootmgr, the chief one being that legacy OSs and "foreign" OSs like Linux canot be booted via bootmgr.efi.
If you want to dual boot a W10 UEFI PC with Linux, you can only do it by letting Linux take control of the boot during installation.
You can then let Linux's grub dual-boot the existing W10 installation.
@dimlog
You are successfully dual-booting XP, so I assume that your W10 is BIOS/MBR, in which case Linux should also be available.
However iirc, there have been a few people reporting a problem when upgrading from a working multi-boot with Linux to a newer distro. Unfortunately I stopped using Linux back when legacy grub was still around, so my Linux knowledge is less than useful to you, but if you search the forum with your non-working distro number as a keyword, you may find something which might give you a workaround.