Hi, i'm new here so please forgive my idiocy. I have a trade route from 1 island to another. It picks up goods fine, but when it has to unload goods, it doesn't it just continues with its trade route without dropping stuff off

You have to select the good to unload at the destination just like you had it set to load.

At the port where it picks up the good, the good has a green box around it so that it picks up.
Right now, at the destination,the good is just listed. Click it and make the box around it red.

u might find this handy swr3fan ..

http://anno1404guide.wikia.com...Anno_1404_Guide_Wiki

Make sure you have set the drip off to - or it will not drop off any thing.