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I've bought CLAM arm too, but you've gotten further along than me in assembly.

My understanding is that the motors don't have the ID numbers programmed in already, and you have to manually set them. There were a couple of scripts in ROS stacks for dynamixel maintenance, setting ID numbers, what's on the bus, etc. I believe it's a matter of plugging each motor in individually, setting its ID, then powering down and moving onto the next. https://github.com/arebgun/dynamixel_motor/tree/master/dynamixel_driver/scripts

Once all the motors are programmed, ROS might be able to see them.

Hope this helps, Gav