The Key Facts \ Timeline Section lives directly underneath the Topline Image Section. You can click on the Key Facts Section Label to toggle between Key Facts & Timeline

To Add an additional Key Fact, either Populate any of the Key Fact placeholder bullets or Press Enter anywhere while you're in a Key Fact.
To Remove a Key Fact or Key Fact Placeholder, Press Backspace. 

To Add an additional Timeline Item, either Populate The Date Label Text and The Respective Key Fact placeholder bullets or Press Enter anywhere while you're in a Key Fact.
To Remove a Key Fact or Key Fact Placeholder, Press Backspace.
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Key Fact Text can be formatted as Bold, Italic, Underline, & Add a Hyperlink by highlighting the desired text.

Timeline Date Items Cannot be formatted