Profile settings contain information and settings related to your user account, as well as the option to changing these.
Opening the settings menu will let you change and update the information related to your account.
Note that E-mail is a unique identifier in Zelo, which means that only 1 user can use a specific E-mail address.
Also keep in mind good password practices to ensure the best security (e.g. 8 characters minimum, use both lowercase and uppercase letters, numbers and special symbols such as !?%/(# etc.)