1. How can i meet Chloe and visit her?

2. Why secrets (adrian) mission have less opacity/gray topics? I can't do it anymore because of my choices? (print of my current quests)

3.  I didin't meet Gabriel and Ken, what I need to do to meet them?

1. Chloe's house can be found in "The Hills".
2. The grayed topics are just what's needed to complete the main quest of accessing Adrian's PC. 
   1. Buy an Injector from the mall
   2. Learn hacking from Samantha at Ken's house
3. Opening their messages on Starmaker will unlock their locations. (The Hills & Suburbs) NOTE: Speak to Anna in the kitchen before going to Ken's house for the first time. Failure to do so will soft-lock that route.