For help on quests, try using the RuneScape Wiki
I have placed a link below that should take you to a quest guide for this quest.
In the very back house of Goblin Village, search it on the map if you don't know where it is
Completing this quest, you will receive:5 Quest Points200 Crafting ExperienceA Gold Bar
I have placed a link below in the "Related Links" section that may be able to help you.
In the quest Goblin Diplomacy, the goblin chiefs end up picking brown goblin mail (undyed). However, you have to give them blue and orange mail first before you can give them the brown mail.
Kill any goblin around Runescape, the Goblin Mail is a drop from them.
No Humans can fit in a goblin mail, only goblins can
there is no goblin tower there are 1 town west of barbian village
get goblin mail (2) dye them blue and brown give them to the goblin general
you kill a couple of goblins they willeventually give you a goblin armoursign:dragwolf56
capes and goblin mail
evrywhere especially in the goblin village