For each ioGates account we have what we call a Public User. You can give this login to everybody that needs to upload files to your account. The Public User is only allowed to upload files, this user cannot see your files.
To access the public upload simply login at www.iogates.com using your Public User credentials. The Public User credentials are available in the welcome email you got when your signup for your ioGates account.
After logging in you will then see the upload page, and then all you need is to drag the files into to and click Send to upload files to your account.
The Public User credentials also works for FTP and Masstransit UDP upload.