Click the Add/Manage Links & Images link under Brand & Links Column in the Admin Tools menu at the top of your Brandboard. Here you can add links, email addresses (which will launch an email within the end user's email system), text, images and other content, as well as headers so you can organize the items in the menu. All items can be reordered with drag and drop on the editing page.
The links section will appear in the left Brand & Links Column under the logo. Any of this content can be copied on another Brandboard using the Brand & Links Column Library.
You can also, of course, add any contact information or links to Clipps within the Brandboard. One important Clipp can be pinned to the first Clipp position (click the gear at the top of the Clipp).