hi all i am new member here but i want a help i want to know how to keep my vbulletin safe of being hacked?

and i need another thing i have seen in this site an a hack for pm nofication like it appears when i have a new pm in this site it preview yes or no i need it and if its already in vbulletin.org plz give me the link for the hack in vbulletin.org because i cant find it there i dont know the name

Just keep your vB updated to latest version and you needn't worry about getting hacked.

As for the PM notification, give me an image I can use and I'll make a hack for it.