To change your cell phone number on your account, click the profile icon in the upper right hand corner of your screen on the giveaway's main page.
Once you do, you'll be shown a screen with your basic account info and a prompt that reads:
"To change your settings we need to send a magic link to your email. Once you click that link you will be able make changes."
Click "Send Email."
Once you receive the email, click the button that reads, "Yes, Access My Account."
You'll then be brought back to your account page with the options to update your name, email, phone number, and more.
Once you make the update, click "Update My Information," and you'll be all set!
Let us know if you have any further questions!