then click on the point on the side of the word blp
follow the path(units\human....)
right click on it a select(extarct BLP (and convert)(i think its called like this)
extract it to the same folder
example:
c:\my custom thingys\paladin\plaladin.mdx
c:\my custom thingys\paladin\plaladin.blp
now u finished step one
step 2
edit the blp
i think u now how to do that
and then convert it to a blp again
step 3
open the mdx pather (link above)
remove the path
example:
units\nerubian\stonneash\stonneash.blp
remove the red part
save
open it(the mdx) with the w3viewer and enjoy taking ur screenys i suggest taking then without shadow(render > shadow)uncheck this>
enjoy
wish this helps