1 Travel north of Falador. Take the left fork road to the Goblin Village (the right fork will lead you up the mountain). And you can also buy runescape account to have more fun.
2 Speak with either General Wartface or General Bentnoze. You'll then get into the middle of an argument about armor colors. Ask them if you can suggest a color for them. You will be asked to get an orange, blue, and brown mail.
3 Go kill goblins until you get two goblin mails. Search the crates in the Goblin Village for the brown one with your runescape accounts cheap.