Those are pre-assigned on the LFO section. Just select one LFO, then choose "wave" as shape, sine should be the first one. Then on LFO one, if you press the select button you'll see that osc1 and osc2 at the same time is one of the options. Unfortunately, there's no direct routing to osc3 - but you can slave it to osc2.
Edit
... and you need to set a value for the amount of modulation, either positive or negative. and you're good to go
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