You're welcome. It can be difficult to explain the PROGMEM stuff in an arduino-like beginner-friendly tutorial, because it involves relatively advanced concepts. It'd all be easier to explain to people who learned microcontroller architecture and assembly language programming first 
(but there weren't enough people who did that, leaving any number of "neat things" undone. So Arduino (and similar competing projects) were needed.)
There's more technical tutorial here that MIGHT help: