> how is the correct sintax for LEGEND? how is it used on the map file?
The LEGEND block goes in the main block, not in a layer.
Here's an example, using a TrueType font, and embedded into the upper-left
corner of the map image.
LEGEND
IMAGECOLOR 255 255 255
KEYSIZE 12 12
LABEL
TYPE truetype
FONT "Arial"
SIZE 9
COLOR 0 0 0
END
STATUS embed
POSITION ul
END