No explanation on Hack Apps on IDA or Hopper?

I'm trying to hack a App DarkRoom I find👇 this but I don't find the hook and There is no one on the site who explains hacking Apps On the ( ida or Hopper ) 0x0000000100550dc4 219442F9 ldr x1, [x1, #0x528] ; 0x100719528@PAGEOFF, "isPremiumUser",@selector(isPremiumUser) void sub_100550dc0() { r16 = *_objc_msgSend; r0 = [r0 isPremiumUser]; goto .l1; .l1: r16 = *_objc_msgSend; r1 = @selector(isPremiumUser); return; }

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