Or (if not using MIDI) skip the final steps and simplystart dragging the sliders with the right mouse button
You can always record any automateable parameter in Renoise by right-dragging the slider - as Akiz points out, the automation is either recorded into the pattern as effect commands or as graphical automation (envelopes). Look for the little icon next to the slider, it will either show a little envelope or some dots…
If the plugin has a gazillion parameters (as they often do), you can use a tool like this to assist you. Renoise does not have a way to record directly from the plugin UI.