1. Type google.com/business into your address bar.
2. Click one of the blue Manage now buttons or Sign in. All three lead you to sign into your Google account.

Once signed in you will be taken to the screen below.

1. Click Info on the left
2. Click the pencil icon next to the web address field to edit.
3. Enter your Houfy URL. Be sure you get it right since GMB can be finicky. You do not want them to reject your account. Your Houfy URL will be different for multiple properties versus a single property.
4. Click Apply.

Note: Edits to your GMB listing may or may not be reviewed to ensure their guidelines are being followed.