Help/Support Help code in Tweak.xm

[mcklane 25 iPhone 6s Plus 10.2]

Hi guys,i'm a newbie and i just trying to learn hack the game. Now i want to hack coin in a game, and i don't know how to write the code in tweak.xm

I have offset of watchpoint is 10098B948, then i found in IDA i have some thing like this:

text:000000010098B924 loc_10098B924                           ; CODE XREF: sub_10098B7C0+94↑j
__text:000000010098B924                 LDR             X0, [X21,#0x28]
__text:000000010098B928                 CBZ             X0, loc_10098B970
__text:000000010098B92C                 LDR             X8, [X0,#0x10]
__text:000000010098B930                 MOV             X1, X23
__text:000000010098B934                 LDR             X2, [X8,#0xA0]
__text:000000010098B938                 LDR             X8, [X2,#0x10]
__text:000000010098B93C                 LDR             X8, [X8,#0x50]
__text:000000010098B940                 BLR             X8
__text:000000010098B944                 STR             W20, [X21,#0x20]
__text:000000010098B948                 LDR             X8, [SP,#0x60+var_58]
__text:000000010098B94C                 MOV             W0, #4
__text:000000010098B950                 STR             X8, [X19,#0x60]
__text:000000010098B954                 SUB             SP, X29, #0x40
__text:000000010098B958                 LDP             X29, X30, [SP,#0x40+var_s0]
__text:000000010098B95C                 LDP             X20, X19, [SP,#0x40+var_10]
__text:000000010098B960                 LDP             X22, X21, [SP,#0x40+var_20]
__text:000000010098B964                 LDP             X24, X23, [SP,#0x40+var_30]
__text:000000010098B968                 LDP             X26, X25, [SP+0x40+var_40],#0x50
__text:000000010098B96C                 RET

I think which register holds my coin is (W20 ). what should i do now, if i want hack my coin raise up with high value.

Thank for reading!