yo where the actual shitting fuck do i fucking go to actually fight anyone in this fucking shit

someone told me it was in the book but ive looked literally fucking everywhere in every stupid book

what the fuck. is it this greyed out shit on the top left that i cant click on? because that seems like the only fucking possibility

ive played this game before and i can find fuck all about where to actually go to play it now so this is just pissing me off at this point