Unfortunately, your link did not work.
A couple of notes here:
1) You should use the Reply with Quotes button when replying to a specific person so everyone reading knows who you are replying to.
2) In the Digital realm, 0dB is the absolute maximum you can go. It's a physical hard limit of the converters. In the Analog realm, you can, and most likely do, go beyond 0dB. With Digital's absolute max at 0, people here are suggesting that you mix your track levels so the master bus levels are somewhere around -6dB to -15dB. That is 6 to 15dB below zero. The meter on the master bus should be marked accordingly.
[Edit:] Going back through the thread, it seems your master bus levels are at a good spot when you render the songs to a two-track mix. You said you've got them at around -10dB coming off the mix bus. No problem there. You then load those two-track files back into Reaper on the timeline to master them. Get them all sounding similar and ready for a CD. During the mastering process, you will want to bump overall volume up. How far up is a matter of taste.... As I said before, I use Ozone's limiter. It's a pretty good tool. I shoot for somewhere between -1dB and -0.3dB on the master bus, post processing. That gets me in the range of most commercially released songs. I don't have to fidget with the volume when I'm listening to my tunes in queue with other songs. [End of Edit]
3) Doesn't look like anyone is upset with you, so please don't worry about that. We are here to help and get you going.