Syntax error: you haven't declared a username in the URL

Correct syntax: http://www.vnwmbadge.freeiz.com/vnsignature.php?parameter1&parameter2&parameter3...
Example: http://www.vnwmbadge.freeiz.com/vnsignature.php?username=Massino&type=militarystrength&strongest_military_skill=jet

Parameters:
username = your Virtual Nations username (case sensitive)
type = type of the badge (militarystrength / economyskills / politicalview / random)

Military strength parameters:
strongest_military_skill = the skill you want to display (firstaid for medic / marskmanship for infantry / tactics for tank / piloting for jet)

Common parameters:
avatar = the URL of an image you want to display
avatar_opacity = the transparency of the avatar
flag_opacity = the transparency of the flag