How to turn up rear speakers on a Yamaha RX v4600 receiver

[Reider]

I have a Yamaha receiver (RX V4600), which I've had for many years and can't remember how to turn up the rear speaker volume. They are way too quiet compared to the front speakers. I have read my manual and have asked my friend who has 3 Yamaha receivers and the problem still hasn't been fixed, so here I am.
(Note: I've also looked on youtube and did a general search on the internet).

In the manual it says,

Amp on remote - I did this

1. click top (title) button - I did this and on the screen of the receiver it says "GUI"
2. Select manual set up, then press (start looking button).

# 2 is where I am stuck. How do I select manual set up? I am stuck with "GUI" on the receiver screen and can't go any further. Can anyone give me DETAILED instructions on how to turn up my rear speakers? It's absolutely driving me crazy and I can't figure it out. My friend and the internet don't seem to be of much help either.

 

[j_garcia]

This receiver has YPAO, which means it can set the speaker levels correctly for you.

RX-V4600 Setup, Configuration and YPAO — Reviews and News from Audioholics

There is certainly going to be a manual adjustment as well, but it sounds like you will ideally need a video feed to your display to more easily access the speaker settings. I had an older receiver that was that way - you could set it up via the front panel, but it was a pain compared to using the GUI on screen.

 

[Reider]

I was able to turn my rear speaker volume up today as soon as I had my tv on the right setting, so I was able to view the receiver menu there.
Thanks for your help!