This video walks you through the first time setup to install the Konnected SmartApps and Device Handlers into your SmartThings instance. In the video, Nate shows you the GitHub installation method (preferred) as well as the manual copy/paste installation method for those of you who can't use GitHub.
SmartThings Classic vs. the new SmartThings app
The new SmartThings app (previously Samsung Connect) does not yet work with any custom SmartApps, including Konnected. To set up and use Konnected, you must use the SmartThings Classic app for iOS or Android (for now).