Question: I had downloaded android vuforia sdk from <https://developer.vuforia.com>.

I want to change teapot object to custom object.

I read so many tutorial but there is no such tutorial to change 3d object.

<https://developer.vuforia.com/resources/dev-guide/replacing-teapot>
also reading this blog but i don't understand.

Please help me.

Answer: 
rajawali is more better to work for 3d game engine with vuforia, i tried many : min3d,jpct-ae, rajawali etc and find rajawali to perform best.
integration complete sample: <https://github.com/MasDennis/RajawaliVuforia>
You can check following source code.

<https://github.com/sidneibjunior/vuforia-jpct>

Use jPCT java 3d game engine.