Ok to use melee you just have to get melee out by pressing 1 i think. Once you have it out left click on some1 so taht they are targeted then left click again to begin to swoop and as you are swooping your charging towards the enemy and i start holding right click as i get pretty close and.. BAM you smack the crap outa them :fight:
Thats just basic though some1 else might wanna post advanced tips but i dunno. Good Luck and Have Fun :]