Save the script to /sdcard/AnkuLua if possible. Or you can find "tapTitans.lua in directory /sdcard/Download. Run AnkuLua and select the script. The click on "Start Service" button. A "play" (triangle) opaque button will appear on lower left corner.
Switch to Tap Titans. Click the "play" button on lower left corner. That's it. Enjoy.
AnkuLua taps the screen quickly (crazily). To stop it, may need to click the stop buttons many times.