In addition to the above guides, which work great for finding all the orbs, I found this video to help those of you like me who are having the worst trouble getting on top of Melissa Fang-Yin's glass dome in the Shai Gen area. I was struggling with this for hours, and after I watched this person's strategy, I was able to scale the globe within minutes.
This solution is ONLY for those who are having trouble getting the one agility orb atop Fang-Yin's dome. The above excellent guides will get you the rest!
I take no credit for this video. All credit goes to the original author of this video.