Clicking "Phone Numbers" after viewing your Personal Information will lead you to the following page.
Review the contact numbers that are on file and click [Add a Phone Number] to do just that. MyNEVADA will insert a new row for you to type a phone number. Enter the required fields and make sure to check the "Preferred" box on the end if you'd like the number listed as primary contact information. Remember to click [Save] when you're finished editing.