Can't click need?

As stated in the Patch 3.3 Looting Changes Support Article: (http://us.blizzard.com/support/article.xml?locale=en_US&articleId=30305):

If an ineligible player selects Need for an item that another player has selected as Disenchant the Disenchant Roll will supersede the false Need roll and the disenchanted materials will be awarded to the winner

Please understand to be eligible to roll need on an item using the Need Before Greed looting method:

• The player's class must be able to equip the item (e.g. Druids cannot roll need on swords)
• The item must be the class' dominant armor type (e.g. Paladins are only able to roll need on plate armor)
• The player's class must not be a pure melee class (e.g. Rogues) if the item has spellpower
Despite these changes, all players will be able to roll greed for any item looted using the updated Need Before Greed looting method.

Please note: The Need Before Greed looting method is the unalterable default looting system for pick-up groups using the Dungeon System.

Sorry for the confusion; Voldose. As stated above, though, if you would like to see changes made to this system, your best course of action would be to create a post on the Suggestions Forum.