We would advise against you changing your username as doing so will change the address of your public profile, break existing web links to your profile and impact search engine results for your uploaded photos and idea books.
However, if you still want to change your username you can follow these steps:
- Sign in to your account
- Go to 'Your Houzz'
- Click 'Edit Profile'
- You will be able to enter a new username in the 'Account Information' section