It's a bit convoluted, so in case you're struggling:
When you’re logged in, mouse over your username. A link for User Control Panel (UCP) etc. pops up in a box. Click this, then on the Overview tab in the UCP you’ll see a bunch of links on the left, under a Front page heading. One of them is Manage drafts giving you the tools to delete, edit or post your drafts.
You can also get there by mousing over Notifications on the index page and clicking See All.