Hooking up outboard effects processor to VF-16?

[Crayon Boy]

I've been trying to hook up an outboard effects processor to my VF-16. Can it be done? The manual is a piece of crap, and it isn't really clear on the subject. I've been trying to use a ring tip insert cable out of the Aux send on the back panel, but where are the returns?? Can someone explain to me how this is done?? Can it be done? Thanks in advance for all responses.

 

[theletterq]

The returns are any unused tracks/track that you have available.