If you have completed the quest you cannot get another.
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If this is for Monkey madness quest, the person you are looking for is Glough.
Runes of magic has nothing to do with Runescape, and no wont can tell you the answer if you don't be more specific.
There are a number of ways to get a Whip in Runescape. The first is to buy it from the Grand Exchange, price is currently 1M. Second is to get it as a drop from another player in PvP, or buy it from someone. Third is to achieve 85 slayer, once you have this go to the slayer tower in the Canifis(check runescape world map for directions) They aren't that rare of a drop, although you definitely wont get one every kill. It could take 100-1000 kills to get one, its all chance.
If you mean the trapdoor at the north-west of the exchange, that is a shortcut for members only.
use a different colored dye on the clothing you want to dye and see if it works. it wont let you do some so be careful