The recommended way to add apps into the Fiori Launchpad is by creating a Semantic Object.  The alternate method via a target URL is described in this document (Target URL Method). 

Configuration Steps

Create a new Semantic Object (Tcode /UI2/SEMOBJ)

Gateway - Create a new application in Customer Launchpad (Tcode LPD_CUST)

You may need to click the "Show Advanced (Optional) Parameters" button to view all the fields that need to be configured.


Create a Tile Catalog in gateway via Fiori Designer

Create a Tile in the Tile Catalog

Create a SAP Role in Gateway and assign users

As a user, add the new tile into own Fiori Launchpad