QUOTE(danger mouse @ Jul 16 2009, 01:54 PM)

no its all on the front , there is a jack fx send but not sure where it returns unless it goes into one of the faders after going into the effects unit , pdf manual here if it helps
http://www.behringerdownload.de/PMP1000_30...7_ENG_Rev_A.pdf[UPDATED] Are you looking at the PWR AMP INSERT jacks top right? If they are insert 1/4" jacks then you will find that send is on either the tip or ring, and return comes via the other. with the sleeve being common ground for both. (According to the manual on page 9 - RING is send, TIP is return).
You will probably need an Insert Lead (Stereo Jack to either two single Jacks or two single Phono plugs).
(I only looked at the photos, I didnt check the manual).
Behringer are good at putting their manuals online, so should give you some examples of how to connect such a similar unit up..
[ADDED] The other option is if you just want to add effects to the microphone channels only - then you could use the Insert I/O jacks for that particular channel instead...
Cheers,
David