Hey there Ashley!
You should configure the folder on the module settings, which should include a “portraits” (required) and “tokens” (optional) subfolders, the name of the images in those folders should have “tags” in them related to the races and jobs, for example: “berserker_human.jpg” is an image which will only be displayed for the job berserker and when the race is “human”, “berserker_human_elf.jpg” adds elf to the race options. If there are no “race tag” that image will be used for all races, the same in case there are no “jobs tag”, meaning they are generic.
The module will then filter and randomly pick amongst the matching images when you randomly generate a npc.
Please let me know if you have any issues and if its working properly on Forge.