You need two copies of uImage.nsboot, one you put on the sdcard, the other you memboot:
novacom boot mem:// < uImage
Go to installer menu->install uImage, and navigate to the copy you put on the sdcard, and reboot.
if you're switching from moboot
Boot "nsboot" from the moboot menu.
Install all your kexec tar files, these are needed for things to show up in the boot menu.
Try booting all your OSes from nsboot.
if you are fine with the state of things, and want to use nsboot as your main bootloader, go to install menu -> replace moboot with nsboot.
If you're doing a new installation
Since at this point you have the default bootloader setup, this is a bit different with regards to testing.
Keep your TP tethered to the PC.
Try booting all your OSes, but you'll have to do the memboot command from recovery mode each time until you select install menu -> replace moboot with nsboot (sort of a misnomer in this case.)
Do so when you are fine with the state of things, and want to use nsboot as your main bootloader.