From the Home Screen
Click the Synapse logo at the top left of the home screen.
Select Log Out from the drop down menu.

OR
Click the Profile Icon at the bottom right of the home screen represented by a person symbol.
Select Log Out from the pop up window.

From the Account Page
Click the Profile button at the bottom right of your home screen
Click the Manage Account button
Click the Sign Out button on the bottom left of your menu bar
