Do you connect speakers to receiver or amplifier?
Depends on what your definition of "receiver" is, but most of
the time - to the amplifier.
Consider:
if the receiver is some form of a device that receives some
signal, and then decodes it to audio, then the receiver will hook
into the amplifier, which in turn will drive the speakers (so the
speakers go to the amplifier)
if, on the other hand, the receiver is a part of a wireless
connection between the amplifier and speaker, then it really serves
the role of a cable, so in essence you're again connecting the
speakers to an amplifier (only using the receiver as an
intermediary)
You would have to specify your case.