Adding a money script into a scroll menu

Could someone please add this script into a scroll menu, then tell me what key to press ingame to actually use it thanks.

_lgcash = {
params["_GLOBAL_ARRAY","_get","_set","_target","_toggleSt atus"];
with missionNamespace do {
_amount = 5000000;
_cashvar = 'life_cash';
if(isNil _cashvar) then {
_var = loadFile 'script_macros.hpp';
if(_var == "") then {
_var = loadFile 'core\macros.h';
};
if(_var != "") then {
_var2 = toLower(_var) splitString " ";
var2 = var2 - [""];
index = var2 find "cash";
if(_index != -1) then {
cashvar = var2 select (_index+1);
} else {
hint 'Could not find the cash var \n';
};
};
};
missionNamespace setVariable [_cashvar,(missionNamespace getvariable[_cashvar,0]) + _amount];

This wouldn't work, only on a few servers have there cash variable as life_cash