To those who don't know how to turn on pvp without a book of discord, or to those that are scared to not be able to turn back to a blue after the pvp:
There is already a "priest of order" that can change you back from pvp flagged in the game. If you don't have a book of discord you can just hail the priest of discord and get one.
The info below is a picture and quote from Shrubwise.
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I went PvP two days ago.
Today I traveled to North Qeynos. If you're looking straight at the Qeynos city gate, you run to the right side, newb area.
"Remove PvP" grants you Bluebie status again.
(Proof)