The Global History View attempts to summarize history, billing and media data into a single interface. You cannot use this view to enter data, only the see summarized data. You should familiarize yourself with the Patient History, Patient Billing and Patient Media views to enter data.
Press the Patient Gloabl History item in the toolbar to see this view:

Pressing the toolbar item will reveal the Patient Global History view:

You can use this view to quickly get an overall look at the data entered for a particular patient.