I'm asking if the blender can be replaced by Ninja, it had only been used a few times?

SOURCE: Ninja blender second time

Put the lid on so the arrows meet up. There is a arrow on the lid and handle put them to gather and blend!

SOURCE: Blades on ninja blender won't spin, but motor seems to be working.

I don't have one, but inspect the shaft, it looks like there is a key on the shaft, then inspect the inside of the blade where it goes on top of the shaft, see if it looks like the shaft has spun out the blade and this is why it's not spinning.

Remove the blade and the container, then turn on and see if the shaft is spinning, it should be most are a direct drive.

So now if the shaft is spinning, that most likely means that the blade hole is broke where it sets on top of the shaft.

Look closely at the inside of the blade, you should see some type of damage like the groves are worn, I hate to see you buy one and it was the shaft that wore, but usually the blade will go first.