Switch it all off, then remove the jumper bars on your speaker terminals at the rear of your speakers.
Then connect the woofers/low to either speakers A or speakers B on the amp. Making sure L+/L- & R+/R- are going to the relevant connections between amp and speaker.
Then connect the tweeters/high to the set of speaker terminals you haven't used on the amp, again making sure L/R, +/- etc are connected to the corresponding terminals between speaker and amp.
Switch it on and select speakers A & B on the amp.
Then listen to some music and see what you think, hope that helps.
Page 17 of the instructions shows a clear diagram, a Google search will bring it up.