Dummy Need Help - Uploading To An Amazon Server?

[Greenguy]

Another site bought some of our old scenes. I asked them how I could get the scenes to them & they told me:

you could use this server access to upload the content. If you prefer another method, feel free to use it.

Server: Amazon S3
Path: ama-general-uploads/home/XxXdirectoryXxX
username: XxXusernameXxX
password: XxXpasswordXxX

Now, the username is long & looks like a NATS code. The password is even longer & has / symbols in it.

Am I or is there some way to access Amazon servers that I'm not aware of?