Having a phone number on your account is important because if you ever get locked out of your account, you will receive a 6 digit code via text message to unlock it. Follow the steps below to update your phone number.
First login to your account at https://app.romwod.com/users/sign_in
Once you have logged in, go to the settings icon on the left side of the screen. It looks like a cog or a gear.
Once you are on the settings page, make sure you are on the account details tab. From here you should be able to see your avatar, email address, name, and phone number.
Input your phone number and make sure to include the country code. Once you have done that, just click the "update details" button at the bottom of the screen and you are all set!