To access an existing Waze Ads account, you should create a new Waze Ads user without proceeding to create a new advertising account.
- Go to waze.com/business and click on Advertise on Waze.
- Sign up with a Google or Waze account.
- If you signed up successfully, you should see the 1st step of the account creation wizard, asking you to enter your business name. Don't proceed past this step, you have created a new user successfully.
Next, ask the person who manages the Waze Ads account to add your email in the permissions list.