I stopped trying.
I thought you had to press 1 or 2 to choose between usb and hdd, but you had to choose with the arrow keys. That was a bit stupid of me..
However, I could start up with the USB (in safe-mode), but not without.I would receive a weird error, I made a picture of it:
So I tried many things on the internet, also things like copying some files from the usb to the hdd so I could boot..
But it didn't worked.. I will attach the error that I would receive when trying to boot from the HDD.
I don't have a lot of experience on getting a hackintosh to work..