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Hi and welcome to FixYa,
Initially, the only reason you would need/use a modulator is when the DVD/VCR has no RF OUT and the Quasar TV has no Audio/Video IN. If this were the case, then connections would be:
- yellow Video Out of DVD/VCD to yellow Video IN of modulator;
- red/white Audio Out of DVD/VCR to red/white Audio In of modulator;
- modulator RF Out to RF/ANT/CABLE IN of the Quasar;
- TV has to be set to either Channel 3 or 4;
- if Modulator has no RF OUT but instead has a small antenna, still the TV has to be set to either Channel 3 or 4.
If however, the DVD/VCR has an RF OUT, then a coaxial patch cord from this could be connected to the RF/ANT/CABLE IN of the Quasar. The TV has to be set to either Channel 3 or 4. There would be no need for the modulator.

Good luck and Thank you for using FixYa.