We haven't got instructions on how to put Bo-XLink on your XBox because I guess we assume if you have a modchip you know how to FTP to your XBox and thus know the file structure of your own XBox and how it works with your dashboard.
We can't assume everyone uses EvoX, or Avalaunch, but you basically put it in a directory on your E or F partition which you know will let it auto-add itself to your menu's configuration.
For myself, that means chucking it in E:\APPS\BOXLINK\ and letting EvoX auto search for default.xbe's in my E:\APPS\ sub-directory. I actually use my own custom MS dashboard, but I'm not going to confuse you with that.
Bo-XLink is like any other homebrew application for your XBox, so the same rules apply. Yes you're right though, the website doesn't have this information on there, because I guess we just assume you know what you're doing to be going into XBins downloading binaries etc etc...