The tab is used to track enter Blog Entries related to the current Traveler.  The Blog Entries will be visible on the Traveler regardless of which step the Blog Entry was entered on.

Entry

Here you can enter your Blog Entry.  Your Blog will be saved with the Traveler and recorded into the listbox.

Blog Entry Listbox

Each entry you make will be displayed in the listbox window. 

There are also some Blog items that are recorded automatically.  Some of these auto entered items include object movements, user log ins/outs, failed log ins, and state changes.