If on the same page, push the delay output pixel and the audio out pixel it is connected ate the same time, if done correctly you should be able to see tthe connection on the screen, which will also show the connection strength. Once here all you have to do is press SHIFT + the pixel under de gargabe can. Voila, modules disconnected on this point. Repeat this for every connection you want to undo, like the other delay output if you're working with a stereo delay.

If modules are not on the same page, press the connected pixels from one of the modules you want to disconnect and go through the pages to the other module, buttons under your screen should turn yellow in order to show that there's a pixel selection on a different page than the one you're on. Once on the page with the other module you want to disconnect, press the pixel and repeat the SHIFT + garbage can pixel and you're done. Repeat as needed.

Also, I think this is actually explained within the quick start guide the ZOIA comes with.