You cant its for PC only but try downloading THE CHEAT.go on google.com and type in the cheat free download for mac and click the first one.
"Its impossible its made with internet not just a program so you can only hack into programs with cheat engine 5.4 not internet stuff hope this answer your question." acctually it is a program,...
No it is not, Its A Memory Scanner, A Hex Editor , etc. It can change certain values of things.
u cnt download it u could but u have to PAY its http://rapidshare.com/files/116720036/Cheat_Engine_5.4_Installer.zip
Roblox staff will find you and ban you forever.