[Plugin: Quick Shop] GBCF implementation help

I love the ease of use of this plugin and really want to use it, but am unclear on where/how to edit the GBCF code. When i drop the code over lines 1286-89, WP just throws errors.

The location (lines 1220 AND 1286-89) seems odd (right over a closing and opening tr?). I’m sure I’m misreading the instructions, but I can’t figure out how else to interpret it.

Can anyone out there please give me a hand and let me know precisely where/how to include those snippets?

(Also posted on the plugin homepage forums, but there’s not a lot of action over there (someone posted a similar problem in December, and nobody has responded yet. eep! I see that Zack Designs has some more help, though, so hopefully I’ll hear something! )