Measure the dimensions of the magazine.
Purchase a frame for the magazine. The frame should provide an extra inch of buffer on all sides of the magazine. Place the magazine in the center of the frame and insert a mat border behind it. This will make it look more complete.
Place the frame face down. Open the backing of the frame.
Place the magazine face down into the frame and center it. If the magazine is too thick, cut the cover of the magazine off and only frame the cover. Fortunately, this will not be required of most magazines.
Place the backing over the back of the magazine. Reattach the backing to the frame.
Lift up the framed magazine and check to make sure it is centered. If it is not, then adjust it.
Mount the frame on the wall.