AMD Boot Arguments - How to modify?

I have a Mac Pro 2012 running OCLP 1.2.1 on Sonoma 14.0. Trying to install a flashed RX 6600 XT but get a black screen after the boot picker screen. Read through the GPU buyer's guide and it states that I need to alter the AMD Boot Arguments (agdpmod=pikera). Where do I modify this boot argument flag? I don't see the option in the OCLP settings anywhere

https://dortania.github.io/GPU-Buyers-Guide/misc/bootflag.html#amd-boot-arguments

submitted by /u/vgscreenwriter
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