There are many types of metal door frames. Some have hidden screws beneath the door stop. Some have a nail flange hidden behind the casing trim.

It would more practical to tear it out and replace it with a new prehung door in a new jamb.

Michael

Here is a link to a fairly common product, found in both steel and aluminum.
http://www.timelyframes.com/trim/trims.htm

To disassemble this frame. Near the floor, using a narrow blade screwdriver, pry the casing loose either on the opening side or the wall side. As the casing is loosened, work upward with the screwdriver. With about 18" loose, you can stop using the screwdriver and start rocking the casing back and forth while pulling out.
With the casing removed, remove the door by removing the hinge pins.
You'll find screws randomly spaced through the flanges under all the casing, remove these and the frame should be able to be lifted slightly so that the floor covering is no longer capturing the door frame on the bottom.
If the door height is 6'8", when you reverse the swing, the hinge location will also be reversed and will be located where the the latch formerly was.
If the door is a 7' and has not been undercut, the frame can be flipped, keeping the hinges on the same side as they are presently.

Thank you sir, this save me a lot of $$$, Appreciative