[Hessah]

You open your skill menu by pressing K.

Next to each squared skill icon, there's a TINY button labeled "P" next to the skill icon. Click on that, this will open up your skill empowering window.

Then you click up and down arrows for the stats that you want to empower. You can roll over your skill icon to see what effects the points add to the skill.

Note that once you've clicked OK, the skill points are used and you cannot change it unless you spend heaps of cash to buy a skill reset scroll.

If you need further explanation let me know, I'll probably do some screenshot for you.