How do you connect a foldback speaker to the Behringer XENYX Q1202USB mixer for live gigs?

[Dunromin8]

How do you connect a foldback speaker to the Behringer XENYX Q1202USB mixer for live gigs? I have a SWAMP PAJ-12BM 2-way, Bi-Amped, 180W RMS Powered PA Speaker that I have tried to set up as a foldback for live gigs but have had no success. Help!!!

 

[Alabalcho]

Mixer' Line Out -> Speaker' Line In. This should work, as per their manuals.
Does the speaker works when you connect it to eg phone?
Does the mixes works when you connect headphones to Line Out?