Help/Support help to mod game

[m0hammed 20k iPhone 8 Plus 11.3]

i need mod free store and i try many offest but game keep crash 

 

SUBS            R0, #0xC
BLX             sub_4888A0
LDR             R2, =(dword_70FB38 - 0x1585E4)
LDR             R1, =(aPurchaseCredit - 0x1585E8)
MOVS            R3, #6
ADD             R2, PC ; dword_70FB38
LDR             R7, [R2]
ADD             R1, PC  ; "Purchase - Credits"
MOV             R2, R4
MOV             R0, R6
STR             R3, [SP,#0x38+var_30]
BLX             sub_48A338
MOV             R0, R4
MOV             R1, R7
MOV             R2, R5
BL              _ZNSt8_Rb_treeIjSt4pairIKjSsESt10_Select1stIS2_ESt4lessIjESaIS2_EE16_M_insert_uniqueIS0_IjSsEEES0_ISt17_Rb_tree_iteratorIS2_EbEOT_ ; std::_Rb_tree<uint,std::pair<uint const,std::string>,std::_Select1st<std::pair<uint const,std::string>>,std::less<uint>,std::allocator<std::pair<uint const,std::string>>>::_M_insert_unique<std::pair<uint,std::string>>(std::pair<uint,std::string> &&)
LDR             R0, [SP,#0x38+var_2C]
MOV             R1, R4
SUBS            R0, #0xC
BLX             sub_4888A0
LDR             R2, =(dword_70FB38 - 0x15860E)
LDR             R1, =(aPurchaseFailed - 0x158612)
MOVS            R3, #7
ADD             R2, PC ; dword_70FB38
LDR             R7, [R2]
ADD             R1, PC  ; "Purchase - Failed"
MOV             R2, R4
MOV             R0, R6
STR             R3, [SP,#0x38+var_30]
BLX             sub_48A338
MOV             R0, R4
MOV             R1, R7
MOV             R2, R5

 

im just learn ida but is hard 

[Ted2 39.1k iPhone 13 Pro 16.0 Donor]

How do u hack it tho?

 

cause idk what causes crash now

Updated August 9, 2017 by Ted2

[m0hammed 20k iPhone 8 Plus 11.3]

this mod is Android 

and im new in the ida i try now a weak to mod with ida  

 

i try to chang  ADD             R1, PC  ; "Purchase - Credits" to hex 0020 

Updated August 9, 2017 by intell