Once you've selected training options there is no way to change them. At the moment its once and for all. I would recommend you cap feeding first.

I've asked se before for a way to change the training options, as some of us lvled synergy early on and had to experiment with what to level as there was not much data out there, but so far no reply.

http://forum.square-enix.com/ffxi/th...hlight=synergy