Access your info by clicking your avatar in the top right corner and selecting 'Account settings'.
To change your personal and business information, hover over the tiles until an edit button appears.
Here you can change your:
First and last name (in the 'Personal info' section this is used for your profile)
Email address
Business name
Address
Legal name (in the 'Your business' section this is your legal first and last name for document creation)
Job title
Phone number
Website