Reply to using roland sp-555 for effects

I've had a roland sp-555 mixer for a while now and it has great built-in effects, recently updated my mixer with an Ecler NUO 3.0 which has send/receive compatibility. Bought that to use my sp-555 for external effects. Wired everything properly and now have no idea how can i apply effects? I mean i get sample sounds when hitting pads, and i can apply effects to these pads, but how can i apply effects to my mixer channels.

Thanks in advance.

Ecler NUO 3.0
https://www.musicstudiodirect.com/sh...ducts/9430.jpg
Roland sp-555
http://www.rolandclan.com/media/23/SP-555.jpg