|I need to know how i can access this firewall directly from the internet offsite...|
I wouldn't do this. It leaves your firewall open to attack from any/everybody on the internet.
If it were me, I'd create a port forward to an internal machine behind said firewall and I'd connect to that machine via Remote Desktop Connection (assuming your connecting from a windows machine to a windows machine) and then I'd connect to the firewall from the internal computer.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.