UI editor customises ribbon menuss, so I assume you mean the menu tabs. OK
It is a tricky subject. You cannot customise the MS ones, though you can make similar ones and hide the real ones.

I'd mention that:
  • There's some great advice on the web. But it addresses different ways toachieve different things so can appear to conflict.
  • I spent twoyears of background working to get a way that worked for me.
  • You're probably keener so good luck.

One author I recommend is Ron de Bruin. Sometimes his translations from his native language can throw a delightful glitch but his thinking and presentation are very clear.