i followed the below steps to add a slider to capture a integer, a score from 0 to 10
1. referenced RangeSlider in SilkUIFramework
2. drop it to the screen, set the input values
3. drop an input text in the second field, change the input type to number, the field is bind to an integer variable.
after publish, it only show a text box
It seems your application doesn't use a SilkUI theme like Dublin or Lisbon, so the slider doesn't have the correct styling. If you need help with setting up an appliction with a SilkUI theme, let me know.