Theiving Skills

[Whiplash56]

Can someone please explain to me how to use the moves: Knock Down, Murder and Master Thief. I learned the skills but I have no idea how to use them.

[Lobedan]

Knock Down: Creep to you target from behind, take a cudgel and make a power attack (long mouse click left).

Murder: Creep to your target from behind, take one handed sword and make a sting-attack.

Master Thief: You have to response to your target while it's sleeping.