Guild Wars 2

Where do I get the runes that attach to armour ? e.g some armour has 2 of 6 runes.
My characters are levels 45 to 20 so maybe I am too low level to make them ?
What class can make them ?

http://wiki.guildwars2.com/wiki/Rune

(With thanks to tehKaiyu.8032)

You can get runes from gear dropped from mobs, craft them, dungeons, or just buy from TP. It just depends which runes you want and you go from there to figure out how to acquire the specific one you want.