Excel VBA: Search multiple ranges for two specific above values and modify an offset cell

I'm currently creating an inventory list for several characters in a game. I'm trying to create an entry form above the inventory list that will search the list for if a character by that name is already carrying that item. If they are, it should add 1 to the Quantity Column. If not, it should add the data entered to the bottom of the list.

Example in context of the image below:
It should be testing cells A9 & B9 to find a match below them. So if the word spellbook is in B9 next to Adrys, it should find Adrys in A20 and Spellbook in B20, then change the quantity value in F20 to 2 by adding 1 to the existing 1. If it fails to find a match for both of those values (Adrys & Spellbook), it should add those value to the A & B cells at the very bottom of the list.
Inventories.PNG


I have been trying several different formulas, but I can never seem to get it (I'm quite new to this and only have a limited understanding. Don't even completely understand what my current formulas do).

My attempted formulas so far that haven't even seemed to be able to create anything, including performing things like Debug.Print on a success, so I'm kinda stumped. Each formula is listed below in order of length. In addition, while some seem like they would return correct values, I don't know how to make them select that cell and then change a value in an offset cell. Any help would be appreciated.

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Try

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Kind regards
Leo