Need to Open Port

Hello,

I have a FortiGate 330D.  I am new to working with this, so if this is a simple question, I apologize in advance for my ignorance.  We have a server that we need to access internally.  The protocol the software uses is currently AFP (port 548).  Due to some issues we are having, the software developer wants to change us to the SMB protocol (port 139).  When I do a port scan with my MacBook's network utility, it shows port 548 open, but port 139 is not.  I have been all over inside the GUI interface attempting to figure out how to open port 139 but I cannot figure it out.  Heck, I can't even figure out how port 548 is open.  Any help would be greatly appreciated.

Thanks,

Martin