There is a set screw under that that holds the spout to the pipe--if that is a push on style---
An Allen wrench is needed to turn the screw----see if you have one---of so---loosen the screw and push the spout back on place----
If not--come tell us---
An Allen wrench is needed to turn the screw----see if you have one---of so---loosen the screw and push the spout back on place----
If not--come tell us---