I have the same unit and the same problem. It's been really cold in my house for weeks now — in a Colorado winter! — and I'm so frustrated! But I just found some videos on YouTube that gave me the idea to follow the gas pipe with my finger, and that should lead to the place to aim the flame. The units in the video are not Rheem RGAC-080A, but the principle should work just the same. I'm going to try it. Why don't they make all gas furnaces the same on the inside, and why not make the pilot location really obvious with a bright red sticker or something so this kind of thing doesn't happen? Grmph.
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Open the the upper panel. There will be another panel behind it, sitting at a 45 degree angle right beneath the pilot control unit. You will see the thermocouple wire and pilot gas tube going into a cut out slot at the bottom of the panel. You will have to loosen two screws on the right and left sides of the panel. Slide the panel up and away from you to see inside. You will see the end of the thermocouple and pilot tube about 6 inches back.