We only recommend changing your username if you really have to. The reason being any links to reviews you have added over social media/email newsletters etc will 404 (error) as the profile URL changes.
To update the username please head to settings -> profile
To update the message which appears next to the icon, head to settings -> profile and scroll until you get to the "Widget Title" / "Widget Description" fields.
Your business name will be replaced by your name on the profile page and various areas across the Reviewdrop network. To update, please navigate to settings -> profile and scroll until the "Business Name" field.