From the STORM dashboard, click on the cog icon next to your website to manage the hosting for that website.
Click on FTP-S.
When you set up a website in STORM, a default FTP user is created for you. You can copy these details into your FTP client by simply clicking on the username and password or click the download button to download the FileZilla config file.
If you need an FTP client some popular programs for Windows are FileZilla and FireFTP. CyberDuck, FileZilla and Transmit are popular for Mac.