Blocks are…. well, blocks which contain information like menus, links, summaries. They are nortmally used for supplementary information and navigation. There are two blocks that are author-editable: Announcements which appears at the bottom left corner of the site and Links which appears in the right sidebar when viewing “The Center and its People”. Both of these can be edited using the links in the “Actions” block in the right sidebar – “Edit Announcements” and “Edit links block”.
Each link will open a standard content edit screen. The body can be edited. When done click “Submit” at the bottom of the edit screen.