On the website, it is possible for users to perform searches and read ratings without creating an account. However, with an account, it will enable you to update and track your ratings, and even follow your preferred doctors. Ratings are not changed. Therefore, logging in provides you with an opportunity to make sure that your ratings are modified and up to date.
Moreover, if you have an account, you just need to log in. Without an account, you will be required to sign up.