Would it help if you read the datasheet on MX-28 so you get a sense as to how it can be controlled?
Well I tried. I Googled "dynamixel mx-28 datasheet" and got the datasheet from http://www.trossenrobotics.com/dynamixel-mx-28-robot-actuator.aspx
but I didn't really learn anything. But I perhaps that's because I don't have the Dynamixel library and thus I don't know what it's capable of.
The problem with the Uno is that there is only one hardware serial port and the Dynamixel library takes it over, meaning no easy way to print debug statements. However that doesn't mean it won't work, you'll just have to work blind. Also it looks
like there's an issue with baud rates you must address - digest that thread carefully before giving up on it.
I have tried, but I'm just drawing blanks because I'm totally new to the Arduino scene. I don't even know the significance of the Tx or Rx and what the serial ports have to do with anything. If anyone would be kind enough to treat me like a complete idiot and explain things from scratch, I would be eternally grateful.