Set Skill

Hi.

I wonder how you set a skill that is normaly is on the right side on the left side? ( attack side ).
What i mean is that the left attack has only a limited skills, but i want to put e.g hydra on it.
Resulting into much easier to attack...

What's the packets to do it ? Or should i just a mephbot and set the left skill from there ? I preffer do to it with packets...