Adding latency to your sound source is the delay, you just need to mix your dry signal in with the delayed signal from the d0 to turn that delayed signal into an “echo”.
Mult your sound source and send one copy straight to your mixer, and the other to your d0. Then just send the d0’s output to the mixer as well. The d0 is more reliant on the rest of your system than other delays because of this (unless you use the A into B internal feedback patch), but it will get you visualizing your signal paths in a way that will really help you out in figuring out other creative patching methods.
Also, I think maybe all these d0 specific posts should be moved to the Mungo Modules thread since they aren’t specifically related to physical modeling, and could be helpful to other people that will likely land there if they’re seeking information on Mungo stuff.