Rub the area lightly with a white wax crayon or a clear "watermark ink" pad (available at craft stores).
Activating the full version unlocks several professional tools not available or restricted in the trial: Batch Processing visual watermark activation key full
: Randomises watermark placement to prevent automated removal. Rub the area lightly with a white wax
If you truly want the full Visual Watermark experience, here are smarter routes: you are essentially using a demo.
Without a full key, you are essentially using a demo.