You can apply needed changes to the start page by replacing IntroPage schema of UIv2 package and applying changes to this replaced schema. This particular schema declares the state of Intro page that you see when you firstly login to the application.
Thanks for the Answer. I tried with creating a replacing client module for SimpleIntro schema in UIV2 package as I just want to add additional link in BasicTile. When I am saving the module I am getting "SimpleIntro not found" error. Could you please help me with this?