My new hyper 7 pcr has just arrived and i haven't started it yet because i'm waiting for my friend to come round and help me. I got told that when you break in the engine you should put the piston at bottom dead center after running but i tried turning my flywheel but it wont go round so i'm scared that when i start it, i wont be able to put it BDC afterwards. Is the silver wheel by the engine, sticking out under the chassis, the flywheel? Does anyone have any ideas? Thanks...

Yes that is the flywheel. All new engines are hard to turn by hand and many times need to be preied with a screwdriver to get them off TDC where the "pinch" is.

Preheat your engine prior to starting it and loosen the glow plug a bit. After you shut the engine off, the flywheel will be much easier to put at BDC since the engine is hot.