Hi everyone, I wonder if I can use a delay using this setup of the ns-2.

Guitar-pedal-in NS2, send NS2-in amp, send amp-return NS2, out NS2-return amp.

If I can, where I have to put it?

it should usually go in the effects loop, thats where I put mine
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usually the delay is after most effects, so i'd say, somewhere after the amp, if you want the delay to ring perfectly it should be after the ns2 also, so my preference would be amp return ns2, out ns2 delay, then return amp