Where can i find the egs who gives you rep in timeless isle? :)
Kill Yaungol. The Timeless Isle is basically a rep grind. A couple of quests provide rep but mostly it is killing mobs.
p.s :Those insignias are account wide,if you have other lvl 90 characters you can do scenarios with them too and send them to the character you are planning to hit exalted with shado-pan assault.