What you seek is indeed found in the guiding module. Go to the guide module, click options, now select the guide tab. You should find a dither control section. Here you tick the "Non-Guide Dither Pulse box. You will have to enter an amount of dither in milliseconds and you may want to adjust s settle time appropriate for your setup. You can also select the frequency of the dither action. Hope that helps.
Just make sure to select only "Non-Guide Dither Pulse" and not the "Dither" box above. I made the mistake of checking both, thinking that the both needed to be on. Next time I loaded EKOS an error message kept popping up about guiding and then the program would close. I had to hunt down the KStars configuration file, open it with a text editor and reset the Dither field to "0", I believe. It worked just fine, after that.