Follow these steps:
Login to your Bluehost cPanel

Choose FTP Accounts Note: While the username will be created using your Main Domain, you may use any of your domain names instead.

Example: If I created the username "username@example.com" and I wanted to create an FTP account for addon.com I would enter the following:

Username: username@example.com
Then in my FTP client I would enter the following

Host: addon.com
Username: username@addon.com
Enter a "Login": username

Enter the Password as needed

Choose the Directory you'd like them to have access to.

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