In your Nomorobo control panel, click ‘Your Phones’.
Next to the number click ‘Edit’.
Then click 'Delete this Phone'.
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If you no longer have access to the number you are trying to disable, (ie you moved, or got a new number) here's what you should do:
1. Click the 'Disable' button next to your number.
2. Ignore the instructions and click 'Next'.
3. Then click 'I'm ready. Call me now'.
4. Allow the bar to complete its check. Then click 'That's it. You're done'.
5. Then you can delete the number by hitting 'Edit' and then 'Delete this Phone'.