Help/Support Hacking in IDA

[NoHax 3k iPhone 6s 11.2.2]

Could anyone help me hack this? 

I've tried changing a sub to an add but the app just crashed as soon as opened, could anyone help me out?

__text:00000001006091DC                 ADD             X8, X20, W26,SXTW#2
__text:00000001006091E0                 LDR             W9, [SP,#0x80+var_68]
__text:00000001006091E4                 STR             W9, [X8,#0x20]
__text:00000001006091E8                 LDR             W8, [X19,#0x50]
__text:00000001006091EC                 ADD             W8, W8, #1
__text:00000001006091F0                 STR             W8, [X19,#0x50]
__text:00000001006091F4                 SUB             SP, X29, #0x50
__text:00000001006091F8                 LDP             X29, X30, [SP,#0x80+var_30]
__text:00000001006091FC                 LDP             X20, X19, [SP,#0x80+var_40]
__text:0000000100609200                 LDP             X22, X21, [SP,#0x80+var_50]
__text:0000000100609204                 LDP             X24, X23, [SP,#0x80+var_60]
__text:0000000100609208                 LDP             X26, X25, [SP,#0x80+var_70]
__text:000000010060920C                 LDP             X28, X27, [SP+0x80+var_80],#0x60
__text:0000000100609210                 RET                     ; int

However when changing the sub to an add I'm not sure I'm doing it right, when I did it I just changed the sub to an add and left it, is there anything else I have to do?

Updated July 26, 2017 by NoHax

[TheArmKing 60.4k iPad Mini 9.3.5]

Dont know much about this but are you sure you have got hold of the right function ? what is the function name ??

[NoHax 3k iPhone 6s 11.2.2]

Yep, I'm definitely sure it's the right one, I got it from lldb and removed alsr and this is where it left me. However it might be a weird function because all the currencies use the same function somehow. 

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@NoHax

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[NoHax 3k iPhone 6s 11.2.2]

2 hours ago, Zimon said:

@NoHax

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I kind of figured out my problem, I just had to sign my binary (not many tutorials said to do it) so I changed some stuff around and nothing works, so I still kinda need help.