Press K, set the skills you want to train (buffs, not smashes) press start training and that's it. If you have mana problem you can buy 10% VE pills in Tibet 2nd village, or farm them in dungeons.
you can train smashes too you'll still need to click on the mobs tho. check mark the repeat box and set timer to 0
Well my bad. I was talking about afk auto training. Oh and if you're worrying about vitality -> it's regenerating if you're online.