You can use the following login details for FTP, replacing your-domain.com with your own domain:

• Server/Host: ftp.your-domain.com
• Username: your-domain.com
• Password: the password you created for FTP in the one.com control panel
• Port: 21

You can find your login details, and reset your password, in the one.com control panel under SSH & FTP on the Advanced settings tile. Click Send to request an email to create a (new) password.

Related articles:

Update your password for FTP or SFTP

How do I log in using SFTP?