Don't be sorry. No such thing as a dumb question. The AN1X fequency modulation is more like a singer's vibrato than a DX 7. You can get the pitch (frequency) of a note to go up and down by modulating it with an LFO.
Experiment. For the moment, don't worry about what these terms mean. Just see what they sound like. Put the synth in sync mode. See what happens when FM only applies to the master osc, then the slave osc, then both. If you use LFO 1 as the source of the modulation ( LFO 1 will make the pitch go up and down) you can pick a variety of different wave forms to modulate the pitch, and you can delay the frequency modulation.
Do you like weird noises? Set the speed of LFO 1 all the way to the right, as fast as it will go. Set the amount of the FM as high as it will go. One of these days I will experiment and see what I can get for metallic drum sounds.
One thing I've just started experimenting with: pitch envelope. The AN1x will slide from a major fith down to unison at a set speed. With both scenes layered, and both with different pitch envelopes, maybe some portamento and osc sync, one can get some wild pads. Just about play themselves.
Jimmy