Read above that, it is one of the probable conditions, "If you see a message that your device is synced with another library." There are 4 other probable causes for that message mentioned there.
If you set your device properly, which you are incapable of, you will not see that message and hence the cause does not apply to you.
1. I set it to "manually manage" the second I unboxed it, before ever putting a single song on it.
2. If you're going to insult me, learn to count and learn directions, The bullet points your referring to are below and there are only 3 of them
> Read above that, it is one of the probable conditions, "If you see a message that your device is synced with another library." There are 4 other probable causes for that message mentioned there.
Like I said, when it's set to sync, it will only sync with one machine—the idea is that the iOS device just contains a copy of that iTunes library. Change the library, and the music changes as well. That bullet point only applies if your iOS device is set to sync (hence the line above it). If it's not set to sync, it does not apply.
However, that's not what you claimed. What you claimed was:
> a device I can only use with music from their store from one computer
You can use music from many music stores, or none at all if you rip your own from CDs. And you can connect to many computers, if your device isn't set to sync with a particular library.
iPhone can only add music or video from a single iTunes Library.
http://support.apple.com/en-us/HT201593