Click on your account, under account settings click "update my settings". In this section you will find multiple options to change your account, including your email address.
In your account settings, click the "delete this account" button, you will be required to fill in your password. Following this, there will be seven days where you can log into your account to recover it before it will be deleted permanently.
In your account settings you can choose the option "convert my account". You will need to confirm your date of birth and parents email, an email will be sent to your parents' account, where they will confirm. Following this, your account will be updated within 48 hours.
Whenever you would like to save a page, you can click the heart icon to "favourite" the page or the bookmark icon to bookmark it. These will then be available in your favourites or bookmark sections.