Can't you post a helpful reply? He obviously doesn't understand.
In windows, navigate to the folder that it tells you and open up the pediaicons.txt . Near the end there should be a list of entries that go something like this:
#ANIMNAME_PRTO_WARRIOR
Warrior
Add one for the beastmansettler, following this format:
#ANIMNAME_PRTO_BEASTMANSETTLER (or whatever its civpedia entry is)
Beastman Settler (This should be the same name as the unit's folder in the Units Folder of your scenario. Once again, I am just guessing its name).