Destination to submit your homework-0 is ftp://cs.pitt.edu/incoming/aronis/cs7/homework-0/. Upcoming homeworks should be uploaded to corresponding directories ftp://cs.pitt.edu/incoming/aronis/cs7/homework-X/. You can use Internet Explorer to upload files via ftp like it is discussed in the recitation today. The naming convention for submitted file is name-HW-X (e.g. CemAkkaya-HW-0.zip). Submitting files with the correct name will be part of your grade.
You can also use FileZilla. Type as host "cs.pitt.edu" and as user "anonymous" and then click on Quick Connect. After connection is established, uploading the file is straightforward.
If you want to re-upload a file, you can't use the same file name. Just name it as a newer version name-HW-X-VX (e.g. CemAkkaya-HW-0-V2.zip) and upload it. I will consider only the latest version when I grade your homework.