1) Make sure you have Xposed Framework
2) Install RootCloak.
3) Enable RootClock in the Xposed Installer app. Do this by opening Xposed Installer, going to Modules, and pressing the check box next to RootClock.
4) Reboot your phone.
5) Open RootClock settings (just open the app from the launcher), and then go to Add/Remove. This is where you will change which apps RootCloak hides root from.
6) If the app you want is not among the default apps, press the + button to add it. Find the app in the list, and press it to add it to the list.
7) Exit RootCloak settings. If the app you just added was already running, either FORCE CLOSE it, or reboot your phone.
8) Run the app to see if root was successfully hidden.