Hi Chanelll! I've posted a private message to you, but i'll say it again anyway.
To disenchant, when you train Enchanting you get two new icons in your skill tab, that place themselves in the general part. It's great to have those on your action bars since it makes it a bit faster using it. Well, say you have a green,blue or purpe item you want to disenchant, click the Disenchant button (which is one of the 2 icons you get when trained) and then click on the item. Since the last patch, you need certain skill levels in Enchanting to disenchant items, depending on the item level.
I hope that solves your problem mate, and good luck!