Inserting Runes

Hello, i'm having trouble inserting a rune into any of my items... for example i double click on the rune (like it says on it) and when i put my pointer over any item, it doesnt matter it's crossed out... am i doing somthing wrong here?

It's a rune for energy storage.

-Fury

try clicking on the piece of armor you wish to use it on

it is a rune for your primary profession i hope and not a secondary profession

edit

i mean i hope you are a primary elementalist

well it does says "Elementalist rune of minor energy storage" are you saying there is class specific runes? man that's retarded if so.

You can only use runes of your primary profession, just like you can only use armor of your primary profession. It keeps the game balanced.