Search the thread for "event editor" and "automation"
Sometimes it's as simple as right clicking, if it's a FL plugin or program function [like volume or tempo] but ANYTHING can be automated.
The trickiness comes from 3rd party vst/dx plugins! You need to check out the sample browser to the left. You'll see a "current project" folder. If you have synths open go to "Generators" and there should be yet another section for each synth. In this case it would be "Fruity Wrapper (Synth1 VSTi/DXi)"
Luckily, all the automatable functions are labeled, however a lot of synths have functions that AREN'T, so you'll have to guess! This sucks but it's the only way, UNLESS you hit "record" and twiddle with the knobs LIVE and UNCUT which can be a little messy o_O