Welcome to the forum!
You've got no worries at all. We'll get you all set up.
The 363 won't process audio over HDMI - it will only pass it out through the HDMI output. So, you're thinking the right way in that you'll want to connect one of the other digital audio connections.
You can reassign which component uses which audio input. It's explained on page 48 of the owner's manual for the 363. So, you can assign one of the optical inputs to the Blu-ray player - no problem.
If you have any other questions, just let us know!
Adam