The microblog portal is the on place where microposts, advanced search and settings are located. You can get there by clicking the link in the application header.
The microblog portal is also available under: http://<Confluence-URL>/plugins/microblog.action.
If you updated to 4.0 some functions moved from the macro timeline sidebar to the portal. This includes the settings for "My Spaces & Topics", E-Mail notifications and the advanced search.
On this page