how i use reflection on ue4 ?

i try to make a puddle but when a use the reflection the material get this collor


Materials reflect automatically, you adjust the roughness value to determine how glossy the reflection is, for something like water you would also turn up the metallic value (which would make it reflect more on surfaces facing towards you). By default you get screen space reflections in your map, but you would also want to add reflection capture probes.