Security problem

I tore out my ignition nothing left the car would start but turn off in a few seconds. I lost the keys I am going to put a push button starter on it. But do not know if it will stay running security I think I have no way to get any acc power. I have the keys now if I push the security button will it disable it so it will stay running. If not what can I do to get it to stay running with the push button? The car is on the street luckily still parking meter I need to get it now. I do not have money to get it if it gets towed.