I can't find upload server login details

[Etcetera]

I forgot the upload server details and it doesn't show on servers/. Where do you find them?

[Xeno]

At the bottom of the page, there will be an "Update permissions" button. Click that, then log in with your main FTP account. At the root there will be an upload folder for you to upload to

[Darkstar]

I forgot the upload server details and it doesn't show on servers/. Where do you find them?

You have FTP access,why would you need the upload server for? You are supposed to upload via your regular FTP account. That is the reason why the upload server login detais are hidden for you on that page: you shouldn't use them anymore...