I'm going to assume that you have already made your Hardware configuration, this implies that you have actually assigned a PPO typr to your drive. Not knowing what PPO type you have used I have a bit of a problem. But I would suggest that being new to this you use one of the following:
PPO Type 3
PPO Type 4
PPO Type 6
PPO Type 7
PPO Type 8
If you have done this then you will also have the in- and output words that were assigned to the drive. For simplicity I will use PPO Type 3, where you will only have the Control Word and the speed reference (output) and the Status Word and the actual speed (input).
If you have assigned the in-/output addresses IW/QW256-258, this is what you have:
QW256: Control Word, this is where you will start/stop the drive. If you use the GE profile a value of 043C (hex) will stop the drive, 047C (hex) will start the drive (847C reverse).
QW258: Reference word, this is where you set the speed. it is scaled from 0-4000 hex and this corresponds to 0-100% of your maximum speed.
IW256: Status word, here you can see what if the drive is ready to run, running ramping and what not.
IW258: Main Actual Value, this is the speed feedback of the drive - letting you know what speed the drive is running at.
That is the basic on how you control a drive like this. If you need more parameters access you need to use a PPO Type with more PCD words. These words are then configured in the drive as to what parameter is mirrored in them. But I do not know te GE drive well enough to help you there.