The handle will raise a few degrees, then the tab on the safety knob prevents it from raising any further. You can turn the safety because of that tab. I'm pretty sure the safety has been installed incorrectly.
The curved notch, I think, ought to be on top and to the left side of the rifle. On mine, it's to the right. I think that tab that prevents the rotation of the bolt ought to be in the bolt channel instead of outside it. The trick now is figuring out how to get the safety off the bolt with the bolt in the gun.