When Laureen refers to the Stick and Stuff, she has the following in mind:
The "stuff" is the product that is being injected. The "stick" refers to sticking a needle into the body, that is, the injection.
You need to code both the injection (the administration which is the "stick" ) and the product, (the "stuff").
The guideline is telling you that code 90281 - 90399 (the stuff) are reported with the administration codes 96365-96368, 96372, 96374,96375. Laureen tried to give you the page in the CPT manual where these codes are found. In my book they start on page 519. I suggest you find where they are listed in your book and make a note on page 458 where the Stuff codes start, vice versa. Then you identify the correct stuff and stick codes, and code both.
Hope this makes it clearer.