Select the Announcements tool from the Tool Menu in the Administration Workspace.
The announcement that you have selected will be green until it is dropped in its new location. It will turn blue for a few seconds before it reverts to the default gray color.
There are also three options that allow you to auto-sort the Announcements:
When you click the columns heading link, an icon appears beside it showing if the list is sorted smallest to largest, or largest to smallest. In the above illustration, the announcements are sorted by subject in A - Z order. If the subject heading is clicked again, the icon will point down showing that sort order has changed to Z - A.