- Log in to your Dashboard
- Navigate to VPS HOSTING 
- Select your VPS: yourvpsname.com 
 -> Click Manage (green button) 
- Go to the SSH Users 
- Click Add User to add a user if you don't already have one.  Add a username and password in the modal and click Save.  
- Click File Manager in the VPS details menu, then Click Open File Manager (green button).  
- Enter the credentials of the user you just created, and your in! Now you can manage your files.
Done!