In order to get the 4 yellow robots to open the Robo Post door, you must first talk to Rise that is sitting above the gate to the next area. She will tell you that you need 40 Rep before she will open it. Hit up some graffiti spots, and then report back to her when you have 40 Rep. She will open the way to the next area!
Once at the next area, you need to make your way left, which will circle back to the right eventually, allowing you to get to the other side of the area (once you enter the big area after the gate, this is to the right). You will have to jump a gap to make it over. After the gap, head up the small set of stairs, and then go down them. AT the bottom of the stairs, go down the ramp towards the Oldhead in red. This is where robot one is.
Robot 1 - Facing the stairs you came down, manual into robot 1.
Robot 2 - Continue to manual until you can jump on the LEFT rail leading back upstairs. You will hit robot number 2.
Robot 3 - Right after robot 3, stay on the rail until it is horizontal, and then jump to the rail on the right. You will run into robot 3.
Robot 4 - Stay on the rail that robot 3 was on, and turn the two corners to the left. Wall ride the sign on the right, and you will hit robot 4, opening the Robo Post door at the bottom of the stairs!
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