Contact support to get the Navigation extension deployed.
Browse through to the Master Data folder and edit the Navigation model.
Add a 'Part' component to the Navigation model.
Add a reference link, choosing what you want displayed when the home button is clicked, and save this.
Now, open up the edit version of a model you want the home button to appear on and select the top level.
Expand the Details tab in the properties tray and you will now see a Navigation property. Click on the drop down menu and you will see the name of the home page you saved in the Navigation model. Select this and save your model
Open the HTML output for this modela dn you will now see a home button on the top bar. Click this and it will take you to the model you selected as the home page.