that photo is showing , from top of photo as seen on the forum,
USB
USB
USB
Firewire
ThunderBolt-2
Ethernet
so to attempt daisy-chaining, you would connect from the ThunderBolt-2 shown, using the captive input cable of the second display, or use a genuine ThunderBolt-2 cable (not just a Mini DisplayPort cable) to the ThunderBolt-2 port of the second display.
Then you may need to cause an event that would get your Mac to query the displays, such as holding the Option key and clicking the (Detect Displays) button that appears in the System Preferences > Displays pane.